@book{149347,
	author = {Petrobras Energía},
	title = {Productos. Petróleo crudo},
	publisher = {Petrobras Energía},
	year = {2003},
	address = {Buenos Aires},
	note = {Sitio visitado en junio de 2003},
	url = {http://www.petrobrasenergia.com/Products/ByType/0,2407,aiCategoryId%252A1115%257Cai%255FIdnLanguage%252A202,00.html}
}