Ha, Quang Minh, Duy Manh Vu, Xuan Thanh Le, and Minh Ha Hoang. “The Traveling Salesman Problem With Multi-Visit Drone”. <i>Journal of Computer Science and Cybernetics</i> 37, no. 4 (October 12, 2021): 465–493. Accessed November 4, 2025. https://jcc.vast.vn/jcc/article/view/16180.