Lauer, Pascal, et al. “Continuing the Quest for Polynomial Time Heuristics in PDDL Input Size: Tractable Cases for Lifted hᵃᵈᵈ”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 35, no. 1, Sept. 2025, pp. 74-83, doi:10.1609/icaps.v35i1.36103.