Piotr Kosiuczenko Georgios Lajios Simulation of Generalised Semi-Markov Processes based on Graph Transformation Systems. 73-86 2007 175 Electr. Notes Theor. Comput. Sci. 4 http://dx.doi.org/10.1016/j.entcs.2007.04.018 db/journals/entcs/entcs175.html#KosiuczenkoL07