@proceedings {MR2164866,
	title = {Semigroups and languages},
	journal = {Proceedings of the workshop held at the University of Lisbon, Lisboa, November 27{\textendash}29, 2002},
	year = {2004},
	pages = {viii+249},
	publisher = {World Scientific Publishing Co. Inc.},
	address = {River Edge, NJ},
	isbn = {981-238-917-2},
	editor = {Ara{\'u}jo, Isabel M. and Branco, M{\'a}rio J. J. and Fernandes, V{\'{\i}}tor H. and Gomes, Gracinda M. S.}
}
