Sze, S. N., Tan, S. Y., Chiew, K. L., & Tiong, W. K. (2020). Two-stage Heuristic for Primary School Timetabling Problem with Combined Classes Consideration. International Journal on Advanced Science, Engineering and Information Technology, 10(3), 1051–1057. https://doi.org/10.18517/ijaseit.10.3.10233