@book{48531,
	author = {Guzmán Armenta, Alvaro.},
	title = {Control químico de la costra negra (Rhyzoctonia solani) Kuhn y roña polvorienta (Spongospora subterranea) (Wallr) Langerh., de la papa, en Almoloya, Hidalgo},
	publisher = {El autor,},
	year = {1995},
	address = {Chapingo, Méx. :}
}