NWOKOLO, Samuel; OGBULEZIE, Julie. Estimation of direct normal irradiance under various sky condi-tions in data sparse tropical ecological zones in Nigeria. International Journal of Advanced Astronomy, [S. l.], v. 5, n. 2, p. 90–105, 2017. DOI: 10.14419/ijaa.v5i2.8329. Disponível em: https://sciencepubco.com/index.php/IJAA/article/view/8329.. Acesso em: 24 nov. 2024.