Veronique Inghelbrecht Bart Steyaert Sabine Wittevrongel Herwig Bruneel An Analytical Approach to Obtain the Interdeparture Time Characteristics in a Multistage VoIP Network. 33-45 2004 27 Telecommunication Systems 1 http://springerlink.metapress.com/index/10.1023/B:TELS.0000032942.90052.83 db/journals/telsys/telsys27.html#InghelbrechtSWB04