SIVARAMAKRISHNAN, M.V. “A Comparative Study of Geomagnetic and Ionospheric Changes at Kodaikanal and Huancayo”. MAUSAM 7, no. 2 (April 1, 1956): 137–146. Accessed September 20, 2024. http://103.215.208.102/index.php/MAUSAM/article/view/4525.