Pijitbanjong, Phajongjit, Chaiya Chomchalao, and Paroon Mayachearw. 2020. “Improved Differential Evolution Algorithms for Solving Multi-Level Location-Allocation Problem: A Case Study of Oil Palm Logistics in Narathiwat Province”. Princess of Naradhiwas University Journal 12 (3):277-95. https://li01.tci-thaijo.org/index.php/pnujr/article/view/243267.