@article{CTT100779655,
  author = {Koshi Takenaka and N. Inoue and Y. Mizuno and Y. Okamoto and N. Katayama and Yuki Sakai and Takumi Nishikubo and Masaki Azuma},
  title = {Extended operating temperature window of giant negative thermal expansion in Sn-doped Ca<sub>2</sub>RuO<sub>4</sub>},
  journal = {APPLIED PHYSICS LETTERS},
  year = 2018,
}

@article{CTT100760096,
  author = {K. Takenaka and T. Shinoda and N. Inoue and Y. Okamoto and N. Katayama and Yuki Sakai and T. Nishikubo and M. Azuma},
  title = {Giant negative thermal expansion in Fe-doped layered ruthenate ceramics},
  journal = {Applied physics express},
  year = 2017,
}

@inproceedings{CTT100867122,
  author = {Lei Hu and Koshi Takenaka and Masaki Azuma},
  title = {Origin and Absence of Giant Negative Thermal Expansion in Ca<sub>2</sub>RuO<sub>4</sub>},
  booktitle = {},
  year = 2021,
}