@book{91548,
	author = {Herrera Leyva, Dionisio de Jesús.},
	title = {Análisis e interpretación geométrica vectorial de conceptos elementales de estadística /},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/103084.pdf}
}