@book{56102,
	author = {Savidge, J.L. and American Gas Association, AGA. Transmission Measurement Comittee and Savidge, J.L. and American Gas Association, AGA. Transmission Measurement Comittee},
	title = {Compressibility factors of natural gas and other related hydrocarbon gases :},
	publisher = {American Gas Association, AGA,},
	year = {1994.},
	address = {Arlington :},
	edition = {2da. ed.}
}