@inproceedings{ubo:14813,
  author = {Ziegler, J.},
  editor = {Bullinger, H.J. and Ziegler, J.},
  chapter = {},
  title = {Standards for multimedia user interfaces - opportunities and issues},
  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,}
}


@inproceedings{ubo:14816,
  author = {Bullinger, H.-J. and Ziegler, J.},
  chapter = {},
  title = {Human-Computer Interaction: Ergonomics and User Interfaces},
  year = {1999},
  publisher = {Lawrence Erlbaum Associates},
  booktitle = {Vol. 1 of the Proceedings of the 8th International Conference on Human-Computer Interaction (HCI International ’99) Munich, Germany August 22-26, 1999; Vol. 1 of the Proceedings of the 8th International Conference on Human-Computer Interaction (HCI I}
}