@misc{indiciae255dfe65e043,
  title = {Helicopter Airborne Laser Positioning System (HALPS)},
  author = {Eppel, Joseph C. and Cross, Jeffrey and Totah, Joseph and Christiansen, Howard},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910065838},
  note = {Source identifier: 19910065838}
}