MODELING GLOBAL, DIRECT, DIFFUSE SOLAR RADIATION AND THE OPTIMUM TILT ANGLE IN SOME SELECTED LIBYAN CITIES . EPH-International Journal of Applied Science, [S. l.], v. 7, n. 3, p. 23–29, 2021. DOI: 10.53555/eijas.v7i3.57. Disponível em: http://eijas.com/index.php/as/article/view/57. Acesso em: 16 sep. 2025.