@misc{indiciae90729becc024,
  title = {Passive range estimation for rotorcraft low-altitude flight},
  author = {Sridhar, B. and Suorsa, R. and Hussien, B.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930068884},
  note = {Source identifier: 19930068884}
}