@book{31902,
	author = {Arana, Juan,},
	title = {Los sótanos del universo  :},
	publisher = {Biblioteca Nueva,},
	year = {2012.},
	series = {Biblioteca Nueva universidad. Manuales y obras de referencia.  },
	address = {Madrid :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/18726/}
}