Shperberg, Shahaf S., Steven Danishevski, Ariel Felner, and Nathan R. Sturtevant. 2021. “Iterative-Deepening Bidirectional Heuristic Search With Restricted Memory”. Proceedings of the International Conference on Automated Planning and Scheduling 31 (1):331-39. https://ojs.aaai.org/index.php/ICAPS/article/view/15978.