Schick, T., and H. Schütze. “Rare Words: A Major Problem for Contextualized Embeddings and How to Fix It by Attentive Mimicking”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 34, no. 05, Apr. 2020, pp. 8766-74, doi:10.1609/aaai.v34i05.6403.