Washio, S., S. Yamada, T. Tanaka, and T. Tanino. 2011. “PARETO-EFFICIENT TARGET BY OBTAINING THE FACETS OF THE EFFICIENT FRONTIER IN DEA”. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO) 2 (1):211-24. https://ph03.tci-thaijo.org/index.php/jnao/article/view/2629.