@inproceedings {INPROC-1999-31,
   author = {Steffen Volz and Dieter Fritsch and Darko Klinec and Alexander Leonhardi and Johannes Sch{\"u}tzner},
   title = {{Nexus: Spatial Model Servers for location aware applications on the basis of ArcView}},
   booktitle = {Proceedings of hte 14th ESRI European User Conference},
   address = {M{\"u}nchen},
   publisher = {k.A.},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   type = {Conference Paper},
   month = {January},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed Systems, Distributed Systems;
                  Universit{\"a}t Stuttgart, Institut f{\"u}r Photogrammetrie (ifp)},
   abstract = {k.A.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-31&engl=1}
}

@inproceedings {INPROC-1999-29,
   author = {Joachim Baumann and Fritz Hohl and Kurt Rothermel and Markus Schwehm and Markus Stra{\ss}er},
   title = {{The Future of Mole}},
   booktitle = {Mobility, Mobile Agents and Process Migration - An Edited Collection},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {January},
   year = {1999},
   language = {German},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {This short paper describes the future development of the mobile agent system
      MOLE and applications based on it.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-29&engl=1}
}

@inproceedings {INPROC-1999-23,
   author = {Stefan Wirag},
   title = {{Adaptive Scheduling of Multimedia Documents}},
   booktitle = {Proceedings of the GI/ITG-Fachtagung ``Kommunikation in Verteilten Systemen},
   address = {Darmstadt},
   publisher = {not available},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {March},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Multimedia documents are of importance in several application areas, such as
      education, advertising and entertainment. Since multimedia documents may
      comprise continuous media, such as audio and video, the presentation of those
      documents may require a significant amount of processing and network resources.
      The amount of resources available during a presentation depends on the system
      configuration and the current system load. Hence, it can happen that there are
      not enough resources to render a multimedia document according to the
      specification resulting in a reduced presentation quality. To cope with those
      situations, documents can integrate presentation alternatives permitting to
      adapt the document presentation to different system configurations and load
      conditions. In this paper, we present an adaptive scheduling algorithm which
      allows to adapt documents conform to our document model Tiempo in environments
      with best-effort assignment of resources.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-23&engl=1}
}

@inproceedings {INPROC-1999-21,
   author = {Stefan Wirag},
   title = {{Adaptive Scheduling of Multimedia Documents}},
   booktitle = {Proceedings of the 11. ITG/VDE Fachtagung, Kommunikation in Verteilten Systemen (KiVS '99)},
   address = {Darmstadt},
   publisher = {Springer},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {March},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   contact = {stefan.wirag@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Multimedia documents are of importance in several application areas, such as
      education, advertising and entertainment. Since multimedia documents may
      comprise continuous media, such as audio and video, the presentation of those
      documents may require a significant amount of processing and network resources.
      The amount of resources available during a presentation depends on the system
      configuration and the current system load. Hence, it can happen that there are
      not enough resources to render a multimedia document according to the
      specification resulting in a reduced presentation quality. To cope with those
      situations, documents can integrate presentation alternatives permitting to
      adapt the document presentation to different system configurations and load
      conditions. In this paper, we present an adaptive scheduling algorithm which
      allows to adapt documents conform to our document model Tiempo in environments
      with best-effort assignment of resources.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-21&engl=1}
}

@inproceedings {INPROC-1999-18,
   author = {Wolfgang Theilmann and Kurt Rothermel},
   title = {{Disseminating Mobile Agents for Distributed Information Filtering}},
   booktitle = {Proc. Joint Symposium ASA/MA'99 of 1st Int. Symp. on Agent Systems and Applications (ASA'99) and 3rd Int. Symp. on Mobile Agents (MA'99), Palm Springs (CA), USA, October 3-6, 1999, IEEE Press (to appear)},
   publisher = {(not available)},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {March},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {An often claimed benefit of mobile agent technology is the reduction of
      communication cost. Especially the area of information filtering has been
      proposed for the application of mobile filter agents. However, an effective
      coordination of agents, which takes into account the current network
      conditions, is difficult to achieve. This contribution analyses the situation
      that data distributed among various remote data servers has to be examined with
      mobile filter agents. We present an approach for coordinating the agents'
      employment, which minimizes communication costs. Validation studies on the
      possible cost savings for various constellations show that savings up to 90\%
      can be achieved in the face of actual Internet conditions.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-18&engl=1}
}

@inproceedings {INPROC-1999-17,
   author = {Uwe Kubach and Kurt Rothermel},
   title = {{A Universal, Location-Aware Hoarding Mechanism}},
   booktitle = {Proceedings of the International Symposium on Handheld and Ubiquitous Computing (HUC '99)},
   address = {Karlsruhe, Germany},
   publisher = {(not available)},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {377--379},
   type = {Conference Paper},
   month = {September},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Hoarding is an often used technique to overcome the disadvantages of wireless
      wide area communication. The basic idea of hoarding is to transfer information
      to a mobile device before it is actually accessed on the device. The main
      problem is to decide which information will be needed on the devices. We
      propose a hoarding mechanism which exploits the fact that the information a
      user accesses depends on his/her geographic location.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-17&engl=1}
}

@inproceedings {INPROC-1999-16,
   author = {Michael Becht and Thorsten Gurzki and J{\"u}rgen Klarmann and Matthias Muscholl},
   title = {{ROLE: Role Oriented Programming Environment for Multiagent Systems}},
   booktitle = {Proceedings of the Fourth International Conference on Cooperative Information Systems (CoopIS'99)},
   address = {Edinburgh, Scotland},
   publisher = {Los Alamitos, California},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {325--333},
   type = {Conference Paper},
   month = {September},
   year = {1999},
   isbn = {0-7695-0384-5},
   keywords = {Cooperation Architecture, Multi Agent Framework},
   language = {English},
   cr-category = {F.4 Mathematical Logic and Formal Languages},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {This paper introduces a programming environment and architecture for the
      development of agent based cooperative applications using a role based
      approach. We focus on the cooperative aspects by introducing cooperation
      processes (CP) as a concept of its own. CPs describe all and only the
      coordination and cooperation parts of an application. The explicit
      documentation of the coordination and cooperation mechanisms used in a MAS
      allows their evaluation and reuse. We are able to change existing and introduce
      new cooperation processes at runtime without modifying the existing agents. We
      specify the cooperative behaviour of an agent in a separate role description.
      The interconnection of these roles constitutes the CP. Describing cooperation
      independent from concrete agents allows to build heterogeneous, federative and
      transformable MAS. We show how agents decide what roles to accept and how the
      agent-role interaction works. Finally we present the ROPE framework and runtime
      environment.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-16&engl=1}
}

@inproceedings {INPROC-1999-15,
   author = {Michael Becht and J{\"u}rgen Klarmann and Ottokar Kulendik and Paul Levi and Matthias Muscholl},
   title = {{A Platform for Supporting Integrated Human and Agent Based Cooperation}},
   booktitle = {Proceedings of the 15th GI/ITG-Fachtagung Architektur von Rechensystemen (ARCS'99)},
   address = {Jena, Germany},
   publisher = {VDE-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {221--224},
   type = {Conference Paper},
   month = {October},
   year = {1999},
   isbn = {3-8007-2482-0},
   language = {English},
   cr-category = {H.1.0 Information Systems Models and Principles General},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Cooperation between humans is supported by means of workflow management systems
      and groupware tools, whereas support for agents mainly consists in
      standardising agent communication languages and developing co-operation
      protocols. Most of these mechanisms are designed for special situations. Thus,
      they do not take into account that characteristics of environment, work,
      persons and agents can change and that relations between dif-ferent
      cooperations exist. In the following, an innovative cooperation model and
      platform is introduced. An ex-tended concept of roles and structured
      communication cares for integration of humans and agents and increases
      flexibility. Our approach enables to change the organisational structure
      without the need to restructure the coop-eration protocols and vice versa.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-15&engl=1}
}

@inproceedings {INPROC-1999-14,
   author = {Cora Burger and Oliver Schramm},
   title = {{Co-authoring in dynamic teams with mobile inividuals}},
   booktitle = {Proceedings of the International Symposium on Handheld and Ubiquitous Computing (HUC 99)},
   editor = {Gellersen},
   address = {Karlsruhe, Germany},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Lecture Notes in Computer Science},
   volume = {1707},
   pages = {374--376},
   type = {Conference Paper},
   month = {September},
   year = {1999},
   keywords = {Handheld CSCW; joint editing; CORBA},
   language = {English},
   cr-category = {C.2.4 Distributed Systems,
                   H.4.1 Office Automation},
   ee = {http://Festival.informatik.uni-stuttgart.de/},
   contact = {caburger@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Current solutions to support co-authoring of documents focus on building new
      systems for participants who are assumed to be connected permanently by a
      network. We propose an alternate approach, that copes with heterogeneous
      editing systems and increasing usage of mobile/handheld devices. Each person is
      allowed to use its favorite editor for isolated as well as for cooperative
      work. This is achieved by using a global standardized document format and a
      suited platform. By choosing a wide spread platform, the flexibility to
      constitute arbitrary teams in spontaneous manner is increased. To treat the
      mobility problem, participants have representatives in a static part of the
      network. A prototypical implementation is presented connecting Emacs with LaTex
      mode to a distributed document environment based on SGML and CORBA.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-14&engl=1}
}

@inproceedings {INPROC-1999-13,
   author = {M. Strasser and J. Baumann and M. Schwehm},
   title = {{An Agent-Based Framework for the Transparent Distribution of Computations}},
   booktitle = {Proceedings of the International Conference on Parallel and Distrbuted Processing Techniques and Applications (PDPTA 1999)},
   address = {Las Vegas, Nevada, USA},
   publisher = {not available},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {June},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-13&engl=1}
}

@inproceedings {INPROC-1999-12,
   author = {A. Leonhardi and U. Kubach},
   title = {{An Architecture for a Distributed Universal Location Service}},
   booktitle = {Proceedings of the European Wireless '99 Conference},
   address = {Munich, Germany},
   publisher = {not available},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {351--355},
   type = {Conference Paper},
   month = {October},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-12&engl=1}
}

@inproceedings {INPROC-1999-11,
   author = {J{\"u}rgen Hauser},
   title = {{Realization of an Extensible Document Model}},
   booktitle = {Proceedings of the Eurographics Multimedia '99 Workshop},
   address = {Milan, Italy},
   publisher = {not available},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Eurographics},
   pages = {113--122},
   type = {Conference Paper},
   month = {September},
   year = {1999},
   isbn = {3-211-83437-0},
   language = {English},
   cr-category = {H Information Systems},
   contact = {juergen.hauser@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-11&engl=1}
}

@inproceedings {INPROC-1999-10,
   author = {J{\"u}rgen Hauser and Frank Scholze and Uwe Albrecht},
   title = {{MAVA - Entwicklung und Integration eines erweiterbaren multimedialen Dokumentationssystems}},
   booktitle = {Proceedings of the 89th Deutscher Bibliothekartag},
   editor = {Margit R{\"u}tzel-Banz},
   address = {Freiburg, Germany},
   publisher = {Vittorio KLostermann},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {57--69},
   type = {Conference Paper},
   month = {May},
   year = {1999},
   isbn = {3-465-02961-5},
   language = {German},
   cr-category = {H Information Systems},
   contact = {frank.scholze@ub.uni-stuttgart.de juergen.hauser@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-10&engl=1}
}

@inproceedings {INPROC-1999-09,
   author = {A. Leonhardi and U. Kubach and K. Rothermel and A. Fritz},
   title = {{Virtual Information Towers - A Metaphor for Intuitive, Location-Aware Information Access in a Mobile Environment}},
   booktitle = {Proceedings of the Third International Symposium on Wearable Computers (ISCW '99)},
   address = {San Francisco, CA, USA},
   publisher = {not available},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {15--20},
   type = {Conference Paper},
   month = {October},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-09&engl=1}
}

@inproceedings {INPROC-1999-08,
   author = {Kurt Rothermel and Christian Maih{\"o}fer},
   title = {{A Robust and Efficient Mechanism for Constructing Multicast Acknowledgement Trees}},
   booktitle = {Proceedings of the IEEE Eight International Conference on Computer Communications and Networks (IEEE ICCCN '99)},
   address = {Boston, MA, USA},
   publisher = {IEEE Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {139--147},
   type = {Conference Paper},
   month = {October},
   year = {1999},
   language = {English},
   cr-category = {C.2 Computer-Communication Networks},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-08/INPROC-1999-08.pdf,
      ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-08/INPROC-1999-08.ps},
   contact = {christian.maihoefer@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {A great variety of todays networked applications require a reliable multicast
      service. A number of the proposed reliable multicast protocols use a positive
      acknowledgment scheme, which returns ACKs to the sender to confirm correct
      delivery. To avoid the well-known implosion problem in the case of large
      receiver groups, often a tree-based approach is used, i.e., receivers are
      organized in a tree and ACK messages are passed along the edges of this
      so-called ACK tree. For building up this tree variations of the Expanding Ring
      Search (ERS) scheme have been proposed. However, our simulations show that ERS
      scales poorly. In this paper, we propose an alternative scheme for building up
      ACK trees. This scheme is based on a so-called token repository service, where
      a token represents the right to connect to a certain node in the corresponding
      ACK tree. Nodes that want to join a group just request a token for this group
      from the (distributed) token repository service. Our simulations show that our
      scheme causes a much lower message overhead than ERS. Moreover, the quality of
      the resulting ACK trees in terms of delay and reliability is in many cases
      higher if generated with our scheme.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-08&engl=1}
}

@inproceedings {INPROC-1999-06,
   author = {L. Feldmann and E. Gilles and A. Reuter and K. Rothermel and V. Sviatniyj and M. Zeitz and G. Hohmann},
   title = {{Frontiers in Simulation}},
   booktitle = {Tagungsband 13, ASIM Symposium Simuolationstechnik},
   address = {Weimar, Germany},
   publisher = {not available},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {September},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-06&engl=1}
}

@inproceedings {INPROC-1999-05,
   author = {F. Hohl and U. Kubach and A. Leonhardi and K. Rothermel and M. Schwehm},
   title = {{Next Century Challenges: Nexus - An Open Global Infrastructure for Spatial-Aware Applications}},
   booktitle = {Proceedings of the Fifth Annual International Conference on Mobile Computing and Networking (MobiCom '99)},
   address = {Seattle, WA, USA},
   publisher = {not available},
   institution = {University of Stuttgart : Collaborative Research Center SFB 627 (Nexus: World Models for Mobile Context-Based Systems), Germany},
   pages = {249--255},
   type = {Conference Paper},
   month = {August},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Due to the lack of a generic platform for location- and spatial-aware systems,
      many basic services have to be reimplemented in each application that uses
      spatial-awareness. A cooperation among different applications is also difficult
      to achieve without a common platform. In this paper we present a platform that
      solves these problems. It provides an infrastructure that is based on computer
      models of regions of the physical world, which are augmented by virtual
      objects. We show how virtual objects make the integration of existing
      information systems and services in spatial-aware systems easier. Furthermore,
      our platform supports interactions between the computer models and the real
      world and integrates single models in a global ``Augmented World''.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-05&engl=1}
}

@inproceedings {INPROC-1999-04,
   author = {W. Theilmann and K. Rothermel},
   title = {{Maintaining Specialized Search Engines through Mobile Filter Agents}},
   booktitle = {Proceedings of the Third International Workshop on Cooperative Information Agents (CIA'99)},
   address = {Uppsala, Sweden},
   publisher = {Springer-Verlag},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   series = {Lecture Notes in Artificial Intelligence},
   volume = {1652},
   type = {Conference Paper},
   month = {June},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-04&engl=1}
}

@inproceedings {INPROC-1999-03,
   author = {W. Theilmann and K. Rothermel},
   title = {{Efficient Dissemination of Mobile Agents}},
   booktitle = {Proceedings of the Workshop on Electronic Commerce and Web-based Applications at the 19th International Conference on Distributed Computing Systems (ICDCS-99)},
   address = {Austin, Texas, USA},
   publisher = {IEEE Press},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   type = {Conference Paper},
   month = {June},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-03&engl=1}
}

@inproceedings {INPROC-1999-02,
   author = {Christian Maih{\"o}fer and Kurt Rothermel},
   title = {{Building Multicast Acknowledgement Trees}},
   booktitle = {Proceedings of GI Multicast Workshop},
   address = {Braunschweig, Germany},
   publisher = {not available},
   institution = {University of Stuttgart, Faculty of Computer Science, Germany},
   pages = {129--144},
   type = {Conference Paper},
   month = {May},
   year = {1999},
   language = {English},
   cr-category = {C.2 Computer-Communication Networks},
   ee = {ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-02/INPROC-1999-02.pdf,
      ftp://ftp.informatik.uni-stuttgart.de/pub/library/ncstrl.ustuttgart_fi/INPROC-1999-02/INPROC-1999-02.ps},
   contact = {christian.maihoefer@informatik.uni-stuttgart.de},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {To avoid the well-known implosion problem, the majority of reliable multicast
      protocols use hierarchical structures to pass acknowledgment messages back to
      the sender. In most cases, a technique called expanding ring search (ERS) is
      used to construct the acknowledgment tree. In this paper we analyse ERS by
      simulation studies. ERS is a simple and fault tolerant approach, but our
      simulation results show that it has disadvantages like great reliance on the
      multicast routing protocol and poor scalability. If the background load exceeds
      a critical level, the message overhead rises exponentially. In this paper, we
      will present an alternative approach based on a so-called token repository
      service. The token repository service stores a token for each successor, a node
      in an ACK tree can accept. To find a node to connect to, the searching node
      just retrieves a token from the token repository. We describe how such a
      service can be implemented in a way that it can handle a large number of
      multicast groups. Our simulation results show that the token repository service
      is scalable, independent of the multicast routing protocol and builds
      well-shaped ACK trees, causing message delays that are comparable to ERS or
      even lower.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INPROC-1999-02&engl=1}
}

@article {ART-1999-01,
   author = {Wolfgang Becker and Cora Burger and J{\"u}rgen Klarmann and Ottokar Kulendik and Frank Schiele and Kerstin Schneider},
   title = {{Rechnerunterst{\"u}tzung f{\"u}r Interaktionen zwischen Menschen: Begriffskl{\"a}rung, Anwendungsgebiete und Basiswerkzeuge.}},
   journal = {Informatik Spektrum},
   publisher = {Springer-Verlag},
   volume = {22},
   number = {6},
   pages = {422--435},
   type = {Article in Journal},
   month = {December},
   year = {1999},
   keywords = {CSCW, Groupware, Teleteaching, Workflow-Management, Elektronischer Handel},
   language = {German},
   cr-category = {H.4.3 Information Systems Applications Communications Applications},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Applications of Parallel and Distributed Systems;
                  University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {Die Rechnerunterst{\"u}tzung von Interaktionen zwischen Menschen wird in
      unterschiedlichen Forschungsgebieten untersucht. Das f{\"u}hrt zu einer
      vielf{\"a}ltigen, {\"u}berlappenden Begriffsbildung unter den Disziplinen. Die dadurch
      bedingte Begriffsverwirrung behindert fach{\"u}bergreifende gemeinsame Entwicklung,
      Standardisierung und Wieder- / Weiterverwendung von Ergebnissen. Im folgenden
      werden daher breit verwendete Grundbegriffe wie CSCW, Kooperation, Konkurrenz,
      Koordination, Kommunikation, Groupware, Workflow-Management, Teleteaching und
      Elektronischer Markt geeignet geordnet. Schwerpunkte liegen dabei auf den
      m{\"o}glichen Anwendungsgebieten sowie auf den durch Rechner unterst{\"u}tzten
      technischen Grundinteraktionen. Damit soll der Beitrag Anwendern und
      Entwicklern helfen, f{\"u}r konkrete Anwendungsprobleme Anforderungen ermitteln zu
      k{\"o}nnen und Grundelemente in existierenden komplexen Systemen zu identifizieren.},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=ART-1999-01&engl=1}
}

@inbook {INBOOK-1999-02,
   author = {L. Feldmann and V. Svjatnyi and V. Lapko and E.-D. Gilles and M. Zeitz and A. Reuter and K. Rothermel},
   title = {{Parallele Simulationstechnik}},
   series = {Problems of Simaulation and Computer Aided Design of Dynamic Systems. Collected Volume of Scientific Papers},
   address = {Donetsk},
   publisher = {Donetsk State Technical University},
   type = {Article in Book},
   month = {January},
   year = {1999},
   language = {German},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-1999-02&engl=1}
}

@inbook {INBOOK-1999-01,
   author = {Joachim Baumann and Fritz Hohl and Kurt Rothermel and Markus Strasser},
   title = {{Mole - Concepts of a Mobile Agent System}},
   series = {Mobiltiy - Processes, Computers and Agents},
   publisher = {acm-press},
   type = {Article in Book},
   month = {January},
   year = {1999},
   language = {English},
   cr-category = {H Information Systems},
   department = {University of Stuttgart, Institute of Parallel and Distributed High-Performance Systems, Distributed Systems},
   abstract = {(not available)},
   url = {http://www2.informatik.uni-stuttgart.de/cgi-bin/NCSTRL/NCSTRL_view.pl?id=INBOOK-1999-01&engl=1}
}