@misc{indiciae7b275da511b2,
  title = {Planar Rotary Motor Using Ultrasonic Horns},
  author = {Sherrit, Stewart and Bao, Xiaoqi and Badescu, Mircea and Chang, Zensheu and Geiyer, Daniel and Allen, Phillip and Ostlund, Patrick and Bar-Cohen, Yoseph},
  year = {2011},
  url = {https://ntrs.nasa.gov/citations/20120004234},
  note = {Source identifier: 20120004234}
}