1. AI2 Macaw: https://techcrunch.com/2022/01/24/ai2-shows-off-an-open-qa-focused-rival-to-gpt3/ or https://medium.com/ai2-blog/general-purpose-question-answering-with-macaw-84cd7e3af0f7
### Paper: https://arxiv.org/abs/2109.02593
2. GPT-3: https://odsc.medium.com/introduction-to-gpt-3-8f629ac975b8
3. Google T5 model: https://ai.googleblog.com/2020/02/exploring-transfer-learning-with-t5.html