@book{1219,
	title = {Nexos},
	publisher = {Secretaria de Ciencia y Tecnica de la Universidad de Mar del Plata,},
	year = {2004},
	address = {Mar del Plata:},
	url = {http://www.mdp.edu.ar/eudem/index.php?page=shop.browse&category_id=17&option=com_virtuemart&Itemid=4&lang=es}
}