@InProceedings{   APWS99-2,
  author        = {{Ralf Ackermann and J\"org Pommnitz and Lars Wolf and Ralf
                  Steinmetz}},
  title         = {{Eine Virtuelle PBX}},
  year          = {1999},
  month         = may,
  journal       = {},
  volume        = {},
  number        = {},
  booktitle     = {1. GI Multicast-Workshop, Braunschweig},
  publisher     = {},
  institution   = {},
  howpublished  = {},
  pages         = {187--197},
  note          = {},
  url           = {http://www.kom.e-technik.tu-darmstadt.de/publications/abstra\
cts/APWS99-2.html}

}