HUDDAR , B. B., and K. R. RAO. “A Combined Sonde for the Measurement of Electrical Conductivity and Potential Gradient in the Atmosphere”. MAUSAM 23, no. 2 (April 1, 1972): 185–188. Accessed September 20, 2024. http://103.215.208.102/index.php/MAUSAM/article/view/5276.