Angström-Prescott empirical model to estimate solar radiation in Norte de Santander, Colombia অনুযায়ী Contreras-Sepúlveda, Wilmer, Galban-Pineda, Migan Giuseppe, Bustos-Márquez, Luis Fernando, Sepúlveda-Mora, Sergio Basilio, Ramírez-Mateus, Jhon Jairo