Heusner, Manuel, Martin Wehrle, Florian Pommerening, and Malte Helmert. “Under-Approximation Refinement for Classical Planning”. Proceedings of the International Conference on Automated Planning and Scheduling 24, no. 1 (May 11, 2014): 365-369. Accessed August 17, 2024. https://ojs.aaai.org/index.php/ICAPS/article/view/13678.