Mielke, Sebastian J., and Jason Eisner. “Spell Once, Summon Anywhere: A Two-Level Open-Vocabulary Language Model”. Proceedings of the AAAI Conference on Artificial Intelligence 33, no. 01 (July 17, 2019): 6843-6850. Accessed April 20, 2024. https://ojs.aaai.org/index.php/AAAI/article/view/4660.