MANI, ANNA, M. V. SIVARAMAKRISHNAN, and S. P. VENKITESHWARAN. “Electric Charge in Clouds at Temperatures above 0° C”. MAUSAM 10, no. 4 (October 1, 1959): 409–414. Accessed June 21, 2024. https://mausamjournal.imd.gov.in/index.php/MAUSAM/article/view/4080.