@misc{indiciaec3bec39163a9,
  title = {Detection And Avoidance Of Obstacles By Helicopters},
  author = {Cheng, Victor H. L. and Sridhar, Banavar},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920000455},
  note = {Source identifier: 19920000455}
}