Lexically Aware Semi-Supervised Learning for OCR Post-Correction Shruti Rijhwani author Daisy Rosenblum author Antonios Anastasopoulos author Graham Neubig author 2021 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal rijhwani-etal-2021-lexically 10.1162/tacl_a_00427 https://aclanthology.org/2021.tacl-1.76/ 2021 9 1285 1302