Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks, Patrick Lewis, Ethan Perez, Aleksandra Piktus, Fabio Petroni, Vladimir Karpukhin, Naman Goyal, Heinrich Küttler, Mike Lewis, Wen-tau Yih, Tim Rocktäschel, Sebastian Riedel, Douwe Kiela, 2020Advances in Neural Information Processing Systems (NeurIPS 2020)DOI: 10.48550/arXiv.2005.11401 - The foundational paper introducing Retrieval-Augmented Generation (RAG), explaining how external knowledge (often retrieved via vector search) can enhance large language models.