Syeda, JA, and M Nasser. “Trend and Variability Analysis and Forecasting of Sunshine-Hour in Bangladesh”. Journal of Environmental Science and Natural Resources 5, no. 2 (April 29, 2013): 109–118. Accessed October 28, 2021. https://www.banglajol.info/index.php/JESNR/article/view/14802.