@InProceedings{guo-EtAl:2018:EMNLP1,
  author    = {Guo, Tszhang  and  Chang, Shiyu  and  Yu, Mo  and  Bai, Kun},
  title     = {Improving Reinforcement Learning Based Image Captioning with Natural Language Prior},
  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     = {751--756},
  url       = {http://www.aclweb.org/anthology/D18-1083}
}