Li J, Fei H, Liu J, Wu S, Zhang M, Teng C, et al. Unified Named Entity Recognition as Word-Word Relation Classification. AAAI [Internet]. 2022 Jun. 28 [cited 2026 May 25];36(10):10965-73. Available from: https://ojs.aaai.org/index.php/AAAI/article/view/21344