SASTRI, NS. “On the Linear Relationship Between the Zurich Sunspot Numbers and the Incident Solar Radio Radiation Flux at 10.7 Cm”. MAUSAM 19, no. 4 (October 1, 1968): 443–445. Accessed September 19, 2024. http://103.215.208.102/index.php/MAUSAM/article/view/5759.