@book{22152,
	author = {Colegio de Postgraduados. Chapingo, Méx. Centro de Estadística y Cálculo},
	title = {Estructura académica},
	publisher = {El Colegio,},
	year = {1977-19},
	address = {Chapingo, Méx. :},
	note = {La biblioteca tiene: 1977, 1979-81, 1982-84,}
}