@book{94934,
	author = {Pirazán Orduz, Luis Germán},
	title = {Clases, problemas y oportunidades},
	publisher = {Oveja Negra, },
	year = {2015},
	address = {[Bogotá, Colombia] :},
	url = {https://public.digitaliapublishing.com/a/37773}
}