@book {RP-92-33,
	title = {Petri Nets as a specification language for manufacturing systems},
	year = {1992},
	pages = {427-436},
	publisher = {Elsevier Science Publishers (North-Holland)},
	organization = {Elsevier Science Publishers (North-Holland)},
	author = {J. Ezpeleta and J. Mart{\'\i}nez},
	editor = {J.C. Gentina and S.G. Tzafestas}
}

