@article{ueffing-ney-2007-word, title = "Word-Level Confidence Estimation for Machine Translation", author = "Ueffing, Nicola and Ney, Hermann", journal = "Computational Linguistics", volume = "33", number = "1", year = "2007", url = "https://preview.aclanthology.org/jlcl-multiple-ingestion/J07-1003/", doi = "10.1162/coli.2007.33.1.9", pages = "9--40" }