Xu, Y., Huang, H., Feng, C. and Hu, Y. 2021. A Supervised Multi-Head Self-Attention Network for Nested Named Entity Recognition. Proceedings of the AAAI Conference on Artificial Intelligence. 35, 16 (May 2021), 14185-14193. DOI:https://doi.org/10.1609/aaai.v35i16.17669.