text: Kalpesh Krishna, Gaurav Singh Tomar, Ankur P. 
  Parikh, Nicolas Papernot, and Mohit Iyyer. 2020. 
  Thieves on Sesame Street! Model Extraction of 
  BERT-Based APIs. In ICLR 2020. 
  
  Yongjie Lin, Yi Chern Tan, and Robert Frank. 2019. 
  Open Sesame: Getting inside BERT’s Linguistic 
  Knowledge. In Proceedings of the 2019 ACL 
  Workshop BlackboxNLP: Analyzing and Inter- 
  preting Neural Networks for NLP, pages 241– 
  253. 
  
  Varun Kumar, Ashutosh Choudhary, and Eunah 
  Cho. 2020. Data Augmentation using Pre- 
  Trained Transformer Models. arXiv:2003.02245 
  [cs]. 
  
  Nelson F. Liu, Matt Gardner, Yonatan Belinkov, 
  Matthew E. Peters, and Noah A. Smith. 2019a. 
  Linguistic Knowledge and Transferability of 
  In Proceedings 
  Contextual Representations. 
  of the 2019 Conference of the North Ameri- 
  can Chapter of the Association for Computa- 
  tional Linguistics: Human Language Technolo- 
  gies, Volume 1 (Long and Short Papers), pages 
  1073–1094, Minneapolis, Minnesota. Associa- 
  tion for Computational Linguistics. 