Ralf Ackermann Vasilios Darlagiannis Utz Roedig Ralf Steinmetz Using DMIF for Abstracting from IP-Telephony Signaling Protocols. 104-115 http://link.springer.de/link/service/series/0558/bibs/1905/19050104.htm 2000 conf/idms/2000 IDMS db/conf/idms/idms2000.html#AckermannDRS00