Shrestha, S., and R. Malla. “Carlson’s Trophic State Index for the Assessment of Trophic State of Phewa, Begnas and Rupa Lakes in Kaski District, Nepal”. Journal of Environment Sciences, vol. 8, no. 1, Dec. 2022, pp. 46-57, doi:10.3126/jes.v8i1.53651.