U.K. MANDAL, U.S. VICTOR, K.V. RAO, N.N. SRIVASTAVA, and K.P.R. VITTAL. “Estimation of Solar Radiation from Temperature and Rainfall Observations”. Journal of Agrometeorology, vol. 5, no. 2, Dec. 2003, pp. 15-26, doi:10.54386/jam.v5i2.646.