SLEDGE-Z: A Zero-Shot Baseline for COVID-19 Literature Search Sean MacAvaney author Arman Cohan author Nazli Goharian author 2020-11 text Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP) Bonnie Webber editor Trevor Cohn editor Yulan He editor Yang Liu editor Association for Computational Linguistics Online conference publication macavaney-etal-2020-sledge 10.18653/v1/2020.emnlp-main.341 https://aclanthology.org/2020.emnlp-main.341/ 2020-11 4171 4179