@misc{indiciae81107c53cbb4,
  title = {Fixed-base simulation evaluation of various low-visibility landing systems for helicopters},
  author = {Koziol, J. S., Jr. and Rempfer, P. S. and Stevenson, L. E.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710010830},
  note = {Source identifier: 19710010830}
}