Markdown (Informal)
[Knowing the Unseen: Estimating Vocabulary Size over Unseen Samples](https://aclanthology.org/P09-1013) (Bhat & Sproat, ACL-IJCNLP 2009)
ACL
- Suma Bhat and Richard Sproat. 2009. Knowing the Unseen: Estimating Vocabulary Size over Unseen Samples. In Proceedings of the Joint Conference of the 47th Annual Meeting of the ACL and the 4th International Joint Conference on Natural Language Processing of the AFNLP, pages 109–117, Suntec, Singapore. Association for Computational Linguistics.