Torralba Arias de Reyna, Álvaro, and Carlos Linares López. “Size-Independent Additive Pattern Databases for the Pancake Problem”. Proceedings of the International Symposium on Combinatorial Search 2, no. 1 (August 19, 2021): 164–171. Accessed May 9, 2026. https://ojs.aaai.org/index.php/SOCS/article/view/18193.