@article{CTT100924173,
  author = {Mika Goto and Tadaaki Tomikawa and Toshiyuki Sueyoshi},
  title = {Efficiency and Mergers and Acquisitions of Electric Utility Companies},
  journal = {},
  year = 2024,
}

@article{CTT100865334,
  author = {Tadaaki Tomikawa and Mika Goto},
  title = {Efficiency assessment of Japanese National Railways before and after privatization and divestiture using data envelopment analysis},
  journal = {Transport Policy},
  year = 2022,
}

@inproceedings{CTT100845045,
  author = {Tadaaki Tomikawa and Mika Goto},
  title = {Assessment of Japanese National Railways Privatization and Divestiture using Data Envelopment Analysis},
  booktitle = {},
  year = 2020,
}