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.PULIAFITO, A., M. Scarpa, and K..S.TRIVEDI,  "Petri nets with k simultaneously enabled generally distributed timedtransitions",  \i PERFORMANCE EVALUATION\i0 , vol. 32, 1998.\par \par .BOBBIO, A., A..PULIAFITO, M. Scarpa, and M..TELEK,  "Time domain analysis of Markov regenerative processes",  \i 8th European Simulation Symposium\i0 , pp. 187?191, 26, 1996.\par \par .CATANIA, V., A..PULIAFITO, M. Scarpa, and L..VITA,  "Concurrent Generalized Petri Nets",  \i Computations with Markov Chains\i0 , Amsterdam, Kluwer Academic Publishers, pp. 359?382, 18 January, 1995.\par \par }