@book {RP-90-14,
	title = {Petri-Net Based Fairness Concepts for Discrete Event Systems},
	year = {1990},
	pages = {549-557},
	publisher = {Birkh{\"a}user},
	organization = {Birkh{\"a}user},
	author = {T. Murata and M. Silva},
	editor = {Rand}
}

