@InProceedings{wu-EtAl:2018:EMNLP2,
  author    = {Wu, Lijun  and  Tian, Fei  and  Qin, Tao  and  Lai, Jianhuang  and  Liu, Tie-Yan},
  title     = {A Study of Reinforcement Learning for 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     = {3612--3621},
  url       = {http://www.aclweb.org/anthology/D18-1397}
}