@book{144156,
	author = {Smith, M.B. and NSI Technologies and SPE Annual Technical Conference and Exhibition (2001 sept. 30-3 oct. : New Orleans) and Bale, A.B. and NSI Technologies},
	title = {Layered modulus effects on fracture propagation, proppant placement, and fracture modeling},
	note = {Disponible en formato PDF.}
}