@book{150017,
	author = {Libecap, Gary D. and National Bureau of Economic Research and Smith, James L. and National Bureau of Economic Research},
	title = {The self enforcing provisions of oil and gas unit operating agreements},
	year = {1999},
	series = {NBER Working Paper Series},
	note = {Navegadores de Internet ; Adobe Acrobat (PDF)},
	url = {http://papers.nber.org/papers/w7142.pdf}
}