@article{ubo:14811,
  author = {Killich, S. and Luczak, H. and Schlick, C. and Weissenbach, M. and Wiedenmaier, S. and Ziegler, J.},
  title = {Task modelling for cooperative work},
  journal = {Behaviour and Information Technology},
  year = {1999},
  volume = {18},
  number = {5},
  pages = {328–335}
}


@inproceedings{ubo:14814,
  author = {Ziegler, J. and Thies, P.},
  editor = {Gärtner, K.P.},
  chapter = {},
  title = {Modellierung kooperativer Arbeitsprozesse mit CoCharts - Konzepte und Notation},
  year = {1999},
  publisher = {DGLR},
  booktitle = {Ergonomische Gestaltungswerkzeuge in der Fahrzeug- und Prozeßführung, 41. Fachausschußsitzung Anthropotechnik der Deutschen Gesellschaft für Luft- und Raumfahrt e.V., DGLR-Bericht 99-02 Stuttgart 19.-20. 10. 1999; Ergonomische Gestaltungswerkzeuge i}
}


@inproceedings{ubo:14812,
  author = {Ziegler, J.},
  editor = {Bullinger, H.J. and Ziegler, J.},
  chapter = {},
  title = {A framework for modelling and designing cooperation support systems},
  year = {1999},
  publisher = {Lawrence Erlbaum Associates},
  booktitle = {Human-Computer Interaction - Communication, Cooperation and Application Design, Proceedings 8th Int. Conf. on Human-Computer Interaction, Vol. 2 Munich Aug. 22-26, 1999; Human-Computer Interaction - Communication, Cooperation and Application Design,}
}