@article{exactdecodingonlatentvariableconditional,
  title = {Exact Decoding on Latent Variable Conditional Models is NP-Hard},
  author = {Xu Sun},
  year = {2014},
  eprint = {1406.4682},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1406.4682v1},
}