@misc{indiciae77a1fe20466c,
  title = {Noise generated by quiet engine fans. 2: Fan A},
  author = {Montegani, F. J. and Schaefer, J. W. and Stakolich, E. G.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740022127},
  note = {Source identifier: 19740022127}
}