Sievers, Silvan, Martin Wehrle, Malte Helmert, and Michael Katz. “Strengthening Canonical Pattern Databases With Structural Symmetries”. Proceedings of the International Symposium on Combinatorial Search 8, no. 1 (September 1, 2021): 91–99. Accessed May 27, 2026. https://ojs.aaai.org/index.php/SOCS/article/view/18429.