1. B. Alex, B. Haddow, C. Grover, Recognising nested named entities in biomedical text, in: Biological, translational, and clinical language processing, 2007, pp. 65–72.
2. Incorporating boundary and category feature for nested named entity recognition;Cao;International Conference on Database Systems for Advanced Applications, Springer,2020
3. Bert: Pre-training of deep bidirectional transformers for language understanding;Devlin,2019
4. G.R. Doddington, A. Mitchell, M.A. Przybocki, L.A. Ramshaw, S.M. Strassel, R.M. Weischedel, The automatic content extraction (ace) program-tasks, data, and evaluation., in: Lrec, Lisbon, 2004, pp. 837–840.
5. M. Eberts, A. Ulges, Span-based joint entity and relation extraction with transformer pre-training, 2019. arXiv preprint arXiv:1909.07755.