@book{32018,
	author = {García Pérez, Guillermo,},
	title = {Elpha :},
	publisher = {Ediciones Polifemo,},
	year = {1993.},
	address = {Madrid :},
	url = {https://login.zproxy.cun.edu.co/login?url=https://www.digitaliapublishing.com/a/18881/}
}