@book{137127,
	author = {International Gas Union, IGU},
	title = {Sitio Web Institucional},
	publisher = {International Gas Union, IGU},
	year = {2002},
	address = {Denmark},
	note = {Sitio Web visitado en julio de 2002. ; Navegadores de Internet},
	url = {http://www.igu.org/}
}