Aminu, F. O., and I. A. Ayinde. 2021. “Technical Efficiency and Technology Gap Ratio in Cocoa Production in Nigeria: A Stochastic Metafrontier-Tobit (Sm-Tobit) Approach”. Research on World Agricultural Economy 2 (3):1-11. https://doi.org/10.36956/rwae.v2i3.420.