@book{6247,
	author = {Chavira Avila, Margarito.},
	title = {Efecto de lombrices de tierra (Lumbricus spp.) sobre acelga (Beta vulgaris I) crecida en tepetate (amarillo) roturado},
	publisher = {El autor,},
	year = {1992},
	address = {Chapingo, Méx. :}
}