Enabling Low-Resource Transfer Learning across COVID-19 Corpora by Combining Event-Extraction and Co-Training Alexander Spangher author Nanyun Peng author Jonathan May author Emilio Ferrara author 2020-07 text Proceedings of the 1st Workshop on NLP for COVID-19 at ACL 2020 Karin Verspoor editor Kevin Bretonnel Cohen editor Mark Dredze editor Emilio Ferrara editor Jonathan May editor Robert Munro editor Cecile Paris editor Byron Wallace editor Association for Computational Linguistics Online conference publication spangher-etal-2020-enabling https://aclanthology.org/2020.nlpcovid19-acl.4/ 2020-07