@book{30357,
	author = {Miguel García, Roberto de. and e-libro, Corp.},
	title = {Criptografía clásica y moderna},
	publisher = {Septem Ediciones,},
	year = {2009.},
	address = {Oviedo :},
	url = {https://elibro.net/ereader/politecnicointernacional/102985}
}