Harabor, Daniel, and Adi Botea. “Breaking Path Symmetries on 4-Connected Grid Maps”. Proceedings of the AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment 6, no. 1 (October 10, 2010): 33-38. Accessed April 24, 2024. https://ojs.aaai.org/index.php/AIIDE/article/view/12393.