@inproceedings{Kray04,
  author    = {Christian Kray and Rainer Wasinger and Gerd Kortuem},
  title     = {{Concepts and Issues in Interfaces for Multiple Users and Multiple Devices}},
  booktitle = {{Workshop on Multi-User and Ubiquitous User Interfaces (MU3I) at IUI/CADUI}},
  year      = {2004},
  pages     = {7--12},
  address   = {Madeira, Portugal}}