@inproceedings{CTT100622649,
  author = {Wei Qiu and Kozo Miki and Yosuke Mizuno and Daisuke Koyama and Kentaro Nakamura},
  title = {Experimental investigations of hybrid transducer-type ultrasonic motor using lubricant},
  booktitle = {IEICE Technical Report},
  year = 2011,
}

@inproceedings{CTT100612512,
  author = {御木功造 and 小山大介 and 中村健太郎 and 石井孝明},
  title = {駆動面を潤滑した超音波モータに用いる駆動面の材料と潤滑剤の検討},
  booktitle = {日本音響学会2010年秋季研究発表会講演論文集},
  year = 2010,
}