Sukto, Seekharin, and Peerayuth Charnsethikul. 2015. “A Hybrid of List-Scheduling and ColumnGeneration for Scheduling of n JobGroups through m Identical Parallel Machines with Minimum Makespan”. Engineering and Applied Science Research 32 (2):237-50. https://ph01.tci-thaijo.org/index.php/easr/article/view/42391.