UMOH, M. D. .; UDO, S. O.; UDOAKAH, Y.-O. N. Estimation of Global Solar Radiation on Horizontal Surface from Sunshine Hours and Other Meteorological Parameters for Calabar, Nigeria. Journal of Asian Scientific Research, [S. l.], v. 3, n. 11, p. 1083–1089, 2013. Disponível em: https://archive.aessweb.com/index.php/5003/article/view/3566. Acesso em: 22 jul. 2024.