@article{CTT100759007,
  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},
  journal = {the Journal of Information Processing},
  year = 2017,
}

@article{CTT100759008,
  author = {Hidetaka Kamigaito and Akihiro Tamura and Hiroya Takamura and Manabu Okumura and Eiichiro Sumita},
  title = {Unsupervised Word Alignment by Agreement Under ITG Constraint},
  journal = {the Journal of Information Processing},
  year = 2017,
}

@inproceedings{CTT100741500,
  author = {Manabu Okumura and Hidetaka Kamigaito and Akihiro Tamura and Hiroya Takamura and Sumita Eiichiro},
  title = {Unsupervised Word Alignment by Agreement Under ITG Constraint},
  booktitle = {},
  year = 2016,
}