Mercedes Granda José M. Drake José A. Gregorio Performance Evaluation of Parallel Systems by Using Unbounded Generalized Stochastic Petri Nets. 55-71 http://www.computer.org/tse/ts1992/e0055abs.htm 1992 18 IEEE Trans. Software Eng. 1 db/journals/tse/tse18.html#GrandaDG92