Smith, Noah A. 2019. Contextual word representations: A contextual introduction. arxiv:1092.06006, version 2, dats Feb 19. 2019.
Twitter commentary regarding the history as recounted in the above (Naftali Tishby and yours truly are among the "& co." referred to by Robert Munro): [1] [2] [3] Goldberg, Yoav. 2017. Neural network methods for natural language processing. Morgan Claypool. Earlier, shorter, open-access journal version: A primer on neural network models for natural language processing: JAIR 57:345--420, 2016. | 
