Carlo Ghezzi, Dino Mandrioli, Sandro Morasca, Mauro Pezzè. A general way to put time in Petri nets. In Sol J. Greenspan, editor, Proceedings of the 5th International Workshop on Software Specification and Design, IWSSD 1989, Pittsburgh, Pennsylvania, USA, 1989. pages 60-67, ACM, 1989. [doi]
Abstract is missing.