@misc{indiciae67a97b718780,
  title = {Analysis of some helicopter operating problems},
  author = {Jenkins, J. L., Jr. and Morris, C. E. K., Jr. and Snyder, W. J. and Ward, J. F.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710021299},
  note = {Source identifier: 19710021299}
}