@InProceedings{fadaee-monz:2018:EMNLP,
  author    = {Fadaee, Marzieh  and  Monz, Christof},
  title     = {Back-Translation Sampling by Targeting Difficult Words in Neural Machine Translation},
  booktitle = {Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing},
  month     = {October-November},
  year      = {2018},
  address   = {Brussels, Belgium},
  publisher = {Association for Computational Linguistics},
  pages     = {436--446},
  url       = {http://www.aclweb.org/anthology/D18-1040}
}