@InProceedings{	  RAR+99-1,
  author	= {Christoph Rensing and Ralf Ackermann and Utz Roedig and
		  Lars Wolf and Ralf Steinmetz},
  title		= {{Sicherheitsunterst\"utzung f\"ur Internet Telefonie}},
  year		= {1999},
  month		= mar,
  journal	= {},
  volume	= {},
  number	= {},
  booktitle	= {{DuD-Fachbeitr\"age Sicherheitsinfrastrukturen}},
  publisher	= {},
  institution	= {},
  howpublished	= {},
  pages		= {},
  note		= {},
  url		= {http://www.kom.e-technik.tu-darmstadt.de/publications/abstracts/RAR+99-1.html}

}