@misc{indiciaeeeefe6d5d3da,
  title = {Rotary Percussive Auto-Gopher for Deep Drilling and Sampling},
  author = {Bar-Cohen, Yoseph and Badescu, Mircea and Sherrit, Stewart},
  year = {2009},
  url = {https://ntrs.nasa.gov/citations/20090029267},
  note = {Source identifier: 20090029267}
}