Chinnasri, Wutthipong, Nidapan Sureerattanan, and Soradech Krootjohn. 2017. “Solving of university course timetabling problem by meta- heuristic: a literature review”. Asia-Pacific Journal of Science and Technology 17 (4):639-59. https://so01.tci-thaijo.org/index.php/APST/article/view/83275.