@inproceedings{improvingneuralmachinetranslationby,
  title = {Improving Neural Machine Translation by Incorporating Hierarchical Subword Features},
  author = {Makoto Morishita and Jun Suzuki and Masaaki Nagata},
  year = {2018},
  booktitle = {COLING 2018 8},
  url = {https://aclanthology.org/C18-1052},
}