@inproceedings{whatmakeswordlevelneuralmachine,
  title = {What Makes Word-level Neural Machine Translation Hard: A Case Study on English-German Translation},
  author = {Fabian Hirschmann and Jinseok Nam and Johannes F{\"u}rnkranz},
  year = {2016},
  booktitle = {COLING 2016 12},
  url = {https://aclanthology.org/C16-1301},
}