@inproceedings{sixchallengesforneuralmachinetranslation,
  title = {Six Challenges for Neural Machine Translation},
  author = {Philipp Koehn and Rebecca Knowles},
  year = {2017},
  booktitle = {WS 2017 8},
  eprint = {1706.03872},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1706.03872v1},
}