Torralba, Álvaro, Stefan Edelkamp, and Peter Kissmann. “Transition Trees for Cost-Optimal Symbolic Planning”. Proceedings of the International Conference on Automated Planning and Scheduling 23, no. 1 (June 2, 2013): 206–214. Accessed May 26, 2026. https://ojs.aaai.org/index.php/ICAPS/article/view/13558.