Shleyfman, Alexander, Michael Katz, Malte Helmert, Silvan Sievers, and Martin Wehrle. “Heuristics and Symmetries in Classical Planning”. Proceedings of the AAAI Conference on Artificial Intelligence 29, no. 1 (March 4, 2015). Accessed March 28, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/9649.