@misc{indiciae284ed9c7ddec,
  title = {Evaluation of the Simple Safe Site Selection (S4) Hazard Detection Algorithm Using Helicopter Field Test Data},
  author = {Luna, Michael E. and Almeida, Eduardo and Spiers, Gary and Villalpando, Carlos Y. and Johnson, Andrew E. and Trawny, Nikolas},
  year = {2017},
  url = {https://ntrs.nasa.gov/citations/20190026883},
  note = {Source identifier: 20190026883}
}