Notas de Matemática - N° 242 http://www.saber.ula.ve/handle/123456789/4747 2006 2026-05-27T12:22:21Z Notas de Matemática http://www.saber.ula.ve/handle/123456789/22751 Notas de Matemática 2006-11-15T09:00:00Z Coulson's integral formula for digraphs. http://www.saber.ula.ve/handle/123456789/22752 Coulson's integral formula for digraphs. Peña, Ismael; Rada, Juan 2006-11-07T09:00:00Z