Maria João Nicolau António Costa Alexandre Santos Vasco Freitas Towards Multi-class Based Multicast Routing. 52-61 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2720&spage=52 2003 conf/hsnmc/2003 HSNMC db/conf/hsnmc/hsnmc2003.html#NicolauCSF03