@book{236016,
	author = {International Conference on Semigroups and Formal Languages and Andr�e, Jorge M. and Universidade de Lisboa.},
	title = {Semigroups and formal languages},
	publisher = {World Scientific,},
	year = {c2007.},
	address = {Singapore ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10188773}
}