Kittilertpaisan, J., Kittilertpaisan, K., & Khatiwat, P. (2016). Technical Efficiency of Rubber Farmers’ in Changwat Sakon Nakhon: Stochastic Frontier Analysis. International Journal of Economics and Financial Issues, 6(6S), 138–141. Retrieved from https://mail.econjournals.com/index.php/ijefi/article/view/3144