@article{CTT100685692,
  author = {Kengo Takeda and N. Nakada and T. Tsuchiyama and S. Takaki},
  title = {Effect of Interstitial Elements on Hall-Petch Coefficient of Ferritic Iron},
  journal = {ISIJ International},
  year = 2008,
}

@inproceedings{CTT100842149,
  author = {K. Takeda and N. Purevsuren and K. Tokimatsu and M. Ikegami and M. Hook},
  title = {Risk Analysis of Japan's Energy Security: With a Focus on the Import of Natural Gas},
  booktitle = {Eco Design 2019},
  year = 2019,
}