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 August 15, 2025. http://www.journals.rgnpublications.com/index.php/jims/article/view/742.