@misc{indiciae49aecc17e4a4,
  title = {Passive obstacle location for rotorcraft guidance},
  author = {Menon, P. K. A. and Chatterji, G. B. and Sridhar, B.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910065023},
  note = {Source identifier: 19910065023}
}