@techreport{dorsch2006concealing,
  title = {{Concealing Presence Information in Instant Messaging Systems---Protocol Specification}},
  author = {Markus Dorsch and Martin Grote and Knut Hildebrandt and Maximilian R\"oglinger and Matthias Sehr and Christian Wilms and Karsten Loesing and Guido Wirtz},
  year = {2006},
  month = {April},
  institution = {Otto-Friedrich-Universit\"at Bamberg, Bamberger Beitr\"age zur Wirtschaftsinformatik und Angewandten Informatik},
  number = {66},
}