@inproceedings{CTT100700000,
  author = {Hidetaka Kamigaito and Taro Watanabe and Hiroya Takamura and Manabu Okumura and Eiichiro Sumita},
  title = {Hierarchical Back-off Modeling of Hiero Grammar based on Non-parametric Bayesian Model},
  booktitle = {},
  year = 2015,
}

@inproceedings{CTT100690559,
  author = {Hidetaka Kamigaito and Taro Watanabe and Hiroya Takamura and Manabu Okumura},
  title = {Unsupervised Word Alignment Using Frequency Constraint in Posterior Regularized EM},
  booktitle = {},
  year = 2015,
}