Here are some academic papers and resources that discuss advancements in fast answer retrieval and question-answering (QA) engines:
1. **BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding**
- Authors: Jacob Devlin, Ming-Wei Chang, Kenton Lee, Kristina Toutanova
- This paper introduces BERT, a transformer-based model that has significantly influenced QA systems by enabling contextual embeddings.
2. **DrQA: A