Blum, Johannes, Ruoying Li, and Sabine Storandt. “Convexity Hierarchies in Grid Networks”. Proceedings of the International Conference on Automated Planning and Scheduling 33, no. 1 (July 1, 2023): 52-60. Accessed October 18, 2024. https://ojs.aaai.org/index.php/ICAPS/article/view/27178.