Coles, Amanda, and Andrew Coles. “LPRPG-P: Relaxed Plan Heuristics for Planning With Preferences”. Proceedings of the International Conference on Automated Planning and Scheduling 21, no. 1 (March 22, 2011): 26–33. Accessed May 26, 2026. https://ojs.aaai.org/index.php/ICAPS/article/view/13445.