@book{2452,
	author = {Bautista Patiño, Betty and Torres Aguilera, Ruth Betty},
	title = {Efectos del 17 Beta Estradiol y la Progesterona en Bovinos Durante la Fase del Levante /},
	publisher = {Unillanos,},
	year = {1990.},
	address = {Villavicencio :}
}