@book{91855,
	author = {Ramírez Sánchez, Susana Elizabeth.},
	title = {Análisis ecológico de la vegetación gypsófila del Valle de Cuatrociénegas, Coahuila, México /},
	publisher = {El autor,},
	year = {2001.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/103393.pdf}
}