@book{30007,
	author = {Universidad Pedagogica y Tecnologica de Colombia.},
	title = {Apuntes del CENES.},
	publisher = {Universidad Pedagogica y Tecnologica de Colombia,,},
	year = {1981-},
	address = {[Tunja (Boyaca), Colombia : :},
	url = {http://virtual.uptc.edu.co/revistas/index.php/cenes}
}