http://www.saber.ula.ve/handle/123456789/4754 2007 Thu, 07 May 2026 00:11:20 GMT 2026-05-07T00:11:20Z http://www.saber.ula.ve/handle/123456789/22766 Notas de Matemática Fri, 29 Feb 2008 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/22766 2008-02-29T09:00:00Z http://www.saber.ula.ve/handle/123456789/22765 Digrafos no-derogatorios. Bravo, Diego; Rada, Juan Mon, 18 Feb 2008 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/22765 2008-02-18T09:00:00Z