@book{3413,
	author = {Vítolo, Daniel Roque and Pardini, Marta G.},
	title = {Problemas y cuestiones sobre los concursos},
	publisher = {AD-HOC},
	year = {2006},
	address = {Buenos Aires :},
	url = {https://biblioeco.unsa.edu.ar/pmb/images/libros/problemas_cuestiones_concursos.jpg}
}