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Horvath, A., M. Scarpa, and M. Telek,  "Phase Type and Matrix Exponential Distributions in Stochastic Modeling",  Principles of Performance and Reliability Modeling and Evaluation: Essays in Honor of Kishor Trivedi on his 70th Birthday, Cham, Springer International Publishing, pp. 3?25, 2016.

Longo, F., M. Scarpa, and A. Puliafito,  "WebSPN: A Flexible Tool for the Analysis of Non-Markovian Stochastic Petri Nets",  Principles of Performance and Reliability Modeling and Evaluation: Essays in Honor of Kishor Trivedi on his 70th Birthday, Cham, Springer International Publishing, pp. 255?285, 2016.