Nitay, D., D. Fisman, and M. Ziv-Ukelson. “Learning of Structurally Unambiguous Probabilistic Grammars”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 35, no. 10, May 2021, pp. 9170-8, doi:10.1609/aaai.v35i10.17107.