Paolo Cremonesi Emilia Rosti Giuseppe Serazzi Xaba: Exact, Approximate, and Asymptotic Solvers for Multi-class Closed Queueing Networks. 71-85 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=1786&spage=0071 2000 conf/cpe/2000 Computer Performance Evaluation / TOOLS db/conf/cpe/cpe2000.html#CremonesiRS00