@book{136873,
	author = {American Gas Association, AGA and American National Standard Institute, ANSI},
	title = {Diaphragm type gas displacement meters (500 Cubic feet per hour capacity and over)},
	publisher = {American Gas Association, AGA},
	year = {2000},
	address = {Washington},
	note = {Disponemos de la 4ta edición de 2000}
}