Okudono, T., M. Waga, T. Sekiyama, and I. Hasuo. “Weighted Automata Extraction from Recurrent Neural Networks via Regression on State Spaces”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 04, Apr. 2020, pp. 5306-14, doi:10.1609/aaai.v34i04.5977.