@book{15098,
	author = {Hernández Rojas, Benito Ramón.},
	title = {Control químico de la maleza en frijol ejotero (Phaseolus vulgaris L.) var. black valentine en Chapingo, México},
	publisher = {El autor,},
	year = {1994},
	address = {Chapingo, Méx. :}
}