Horčík R, Fišer D, Torralba Álvaro. Homomorphisms of Lifted Planning Tasks: The Case for Delete-Free Relaxation Heuristics. AAAI [Internet]. 2022 Jun. 28 [cited 2026 May 26];36(9):9767-75. Available from: https://ojs.aaai.org/index.php/AAAI/article/view/21212