@misc{indiciae2a9197cb0f43,
  title = {Method of fan sound mode structure determination},
  author = {Pickett, G. F. and Sofrin, T. G. and Wells, R. W.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780009121},
  note = {Source identifier: 19780009121}
}