Asai, Masataro, and Hiroshi Kajino. “Towards Stable Symbol Grounding With Zero-Suppressed State AutoEncoder”. Proceedings of the International Conference on Automated Planning and Scheduling 29, no. 1 (May 25, 2021): 592-600. Accessed October 20, 2021. https://ojs.aaai.org/index.php/ICAPS/article/view/3526.