@article{hkws06,
  author="Paul Holleis and Matthias Kranz and Anneke Winter and Albrecht Schmidt",
  title="{P}laying with the {R}eal {W}orld",
  journal="Journal of Virtual Reality and Broadcasting",
  year="2006",
  volume="3",
  number="1",
  month=apr,
  note="{\tt urn:nbn:de:0009-6-2948}, 
  ISSN 1860-2037"
}