@book{86790,
	author = {Bertalanffy, Ludwig von,},
	title = {Perspectivas en la teoría general de sistemas :},
	publisher = {Alianza,},
	year = {1979.},
	series = {Alianza Universidad ;},
	address = {Madrid :},
	note = {Tít. orig. : Perspectives on system theory: scientific-philosophical studies.}
}