@misc{indiciae3bfd453f3bd9,
  title = {Ultrasonic rotary-hammer drill},
  author = {Bar-Cohen, Yoseph and Badescu, Mircea and Sherrit, Stewart and Bao, Xiaoqi and Kassab, Steve},
  year = {2010},
  url = {https://ntrs.nasa.gov/citations/20100028086},
  note = {Source identifier: 20100028086}
}