@book{138174,
	author = {Workshop Semigroups and Languages and Ara�ujo, Isabel M. and Universidade de Lisboa.},
	title = {Proceedings of the Workshop Semigroups and Languages},
	publisher = {World Scientific,},
	year = {c2004.},
	address = {River Edge, NJ :},
	note = {Proceedings of workshop held at the Center of Algebra of the University of Lisbon.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10173936}
}