@book {RP-82-02,
	title = {A simple and fast algorithm to obtain all invariants of a generalized Petri net},
	year = {1982},
	pages = {301-310},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	author = {J. Mart{\'\i}nez and M. Silva},
	editor = {W. Reisig}
}

