@article{CTT100834356,
  author = {Eiichi Sasaki and Takashi Ueda and Kouichi Takeya and Hiroshi Yamaguchi},
  title = {Vibration sensors using power generation with electret for bridge monitoring},
  journal = {Sensors and Materials},
  year = 2017,
}

@article{CTT100742699,
  author = {Eiichi Sasaki and Takashi Ueda and Koichi Takeya and Hiroshi Yamaguchi},
  title = {Vibration Sensors Using Power Generation with Electret for Bridge Monitoring},
  journal = {Sensors and Materials},
  year = 2017,
}