Acquah, Henry de-Graft. “Sensitivity of Technical Efficiency Estimates to Estimation Methods: An Empirical Comparison of Parametric and Non-Parametric Approaches”. Applied Studies in Agribusiness and Commerce, vol. 8, no. 1, Aug. 2014, pp. 67-72, https://doi.org/10.19041/APSTRACT/2014/1/8.