Muangwai, Alongkorn, and Kwanniti Kkammuang. “OLVING ELLULAR ANUFACTURING YSTEM ROBLEM ITH PERATOR SSIGNMENT IA ETAHEURISTICS”. Life Sciences and Environment Journal 18, no. 1 (March 30, 2017): 72-82. ccessed December 4, 2021. https://ph01.tci-thaijo.org/index.php/psru/article/view/59266.