@book{155727,
	author = {Leythaeuser, D. and Nuclear Research Centre. Institute of Petroleum and Organic Geochemistry and World Petroleum Congress (12th : 1987 26 abr/1 may : Houston) and Schaefer, R.G. and Nuclear Research Centre. Institute of Petroleum and Organic Geochemistry},
	title = {On the primary migration of petroleum}
}