@book{105037,
	author = {Barba Vare, Rosa María Guadalupe },
	title = {Análisis combinatorio},
	publisher = {UNAM; FCA; SUAyED},
	year = {2017},
	url = {https://programas.cuaed.unam.mx/repositorio/moodle/pluginfile.php/804/mod_resource/content/4/contenido/index.html}
}