SHALTOUT, M. A. MOSALLAM, and M. T. Y. TADROS. “Correlation Analysis Between the Sunspots and the Nile Flood”. MAUSAM 41, no. 4 (October 1, 1990): 55–58. Accessed November 23, 2024. http://103.215.208.102/index.php/MAUSAM/article/view/2784.