@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}
}