Hollick, Matthias and Meissner, Andreas and Wolf, L. and Steinmetz, Ralf (2001):
A Security Model for Multicast Group Integrity Management.
In: Poster Session of Third International Workshop on Networked Group Communication, UCL, London, UK, Organised by UCL and COST 264 in cooperation with ACM SIGCOMM,
London, Third International Workshop on Networked Group Communication, London, UK, November 7–9, 2001, [Conference or Workshop Item]

Ackermann, Ralf and Rensing, C. and Noll-Hussong, S. and Wolf, L. and Steinmetz, Ralf (2000):
SSS4it - secure session setup für Internet-Telefonie.
In: Systemsicherheit 2000 <2000, Bremen>: Tagungsbd. S. 140-150, [Conference or Workshop Item]

Roedig, Utz and Ackermann, Ralf and Tresse, M. and Wolf, L. and Steinmetz, Ralf (2000):
Verbesserte Systemsicherheit durch Kombination von IDS und Firewall.
In: Systemsicherheit 2000 <2000, Bremen>: Tagungsbd. S. 118-128, [Conference or Workshop Item]