@misc{indiciaedaa60b9243b1,
  title = {Acoustically swept rotor},
  author = {Schmitz, F. H. and Boxwell, D. A. and Vause, R.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800005851},
  note = {Source identifier: 19800005851}
}