@book{9936,
	author = {Cotton, Peter B. and Williams, Christopher B.},
	title = {Tratado practico de endoscopia digestiva /},
	publisher = {Ediciones Cientificas y Tecnicas,},
	year = {1992.},
	series = {Masson-Salvat Medicina},
	address = {Barcelona :},
	note = {Incluye bibliografia e indice.}
}