Punyakum, V., K. Nitisiri, K. . Sethanan, and D. . Singpommat. “A Self-Adaptive Differential Evolution for the Technician Routing and Scheduling Problem”. Engineering and Applied Science Research, vol. 50, no. 3, May 2023, pp. 262-9, https://ph01.tci-thaijo.org/index.php/easr/article/view/251019.