Chiari, M., S. Zhao, A. Botea, A. E. Gerevini, D. Harabor, A. Saetti, M. Salvetti, and P. J. Stuckey. “Cutting the Size of Compressed Path Databases With Wildcards and Redundant Symbols”. Proceedings of the International Conference on Automated Planning and Scheduling, vol. 29, no. 1, May 2021, pp. 106-13, https://ojs.aaai.org/index.php/ICAPS/article/view/3465.