1. Chen, D., Yih, S.: ACL2020 tutorial: Open-domain Question and Answering. https://github.com/danqi/acl2020-openqa-tutorial. Accessed 5 Jul 2020
2. Juan, R.: Using tf-idf to determine word relevance in document queries. In: Proceedings of the First Instructional Conference on Machine Learning. vol. 242. no. 1 (2003)
3. Stephen, R., Zaragoza, H.: The probabilistic relevance framework: BM25 and beyond. In: Foundations and Trends® in Information Retrieval. vol. 3. no. 4, pp. 333–389 (2009)
4. Jacob, D., et al.: BERT: Pre-training of deep bidirectional transformers for language understanding (2018). arXiv preprint arXiv:1810.04805
5. Yinhan, L., et al.: RoBERTa: A robustly optimized BERT pretraining approach (2019). arXiv preprint arXiv:1907.11692