http://www.saber.ula.ve/handle/123456789/4747 2006 Wed, 27 May 2026 14:22:06 GMT 2026-05-27T14:22:06Z http://www.saber.ula.ve/handle/123456789/22751 Notas de Matemática Wed, 15 Nov 2006 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/22751 2006-11-15T09:00:00Z http://www.saber.ula.ve/handle/123456789/22752 Coulson's integral formula for digraphs. Peña, Ismael; Rada, Juan Tue, 07 Nov 2006 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/22752 2006-11-07T09:00:00Z