Unsupervised Alignment-based Iterative Evidence Retrieval for Multi-hop Question Answering Vikas Yadav author Steven Bethard author Mihai Surdeanu author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication yadav-etal-2020-unsupervised 10.18653/v1/2020.acl-main.414 https://aclanthology.org/2020.acl-main.414/ 2020-07 4514 4525