@misc{indiciae21b9892e9906,
  title = {Effect of tip shape on blade loading characteristics for a two-bladed rotor in hover},
  author = {Ballard, J. D. and Orloff, K. L. and Luebs, A. B.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790065041},
  note = {Source identifier: 19790065041}
}