@book{91140,
	author = {Callejas Martínez, Roberto.},
	title = {Tratamiento anaerobio de aguas residuales y uso de humedades para pulimiento /},
	publisher = {El autor,},
	year = {2005.},
	address = {Chapingo, Méx. :},
	url = {http://10.13.5.2/tesis/102675.pdf}
}