G. Selvam, K. Mathevan Pillai, and S. K.Abirami, “Stochastic Frontier Production Function an Application of the Coconut Farms in Coimbatore District”, IJET, vol. 7, no. 2.33, pp. 1120–1122, Jun. 2018, doi: 10.14419/ijet.v7i2.33.17921.