Olli-Matti Penttinen Tino Pyssysalo Leo Ojala Performance Analysis of Adaptive Video on Demand Using Stochastic Petri Nets. 119-124 1997 HICSS (5) http://csdl.computer.org/comp/proceedings/hicss/1997/7734/05/7734050119abs.htm db/conf/hicss/hicss1997-5.html#PenttinenPO97