Adejumo, A. O., and E. A. Suleiman. “Application of ARMA-GARCH Models on Solar Radiation for South Southern Region of Nigeria”. Journal of Informatics and Mathematical Sciences 9, no. 2 (August 30, 2017): 405–416. Accessed May 6, 2024. https://www.rgnpublications.com/journals/index.php/jims/article/view/742.