@book{2809,
	author = {Ramírez Arcos, Juan.},
	title = {Efectos de contaminantes de tipo hodrocarburo en lechuga (Lactuca sativa) bajo condiciones de invernadero},
	publisher = {El autor,},
	year = {1991},
	address = {Chapingo, Méx. :},
	note = {D47-101}
}