Zheng, Jiongzhi, Kun He, Jianrong Zhou, Yan Jin, and Chu-Min Li. “Combining Reinforcement Learning With Lin-Kernighan-Helsgaun Algorithm for the Traveling Salesman Problem”. Proceedings of the AAAI Conference on Artificial Intelligence 35, no. 14 (May 18, 2021): 12445-12452. Accessed January 26, 2022. https://ojs.aaai.org/index.php/AAAI/article/view/17476.