@misc{indiciaef67979c87ee2,
  title = {Propeller aircraft interior noise model: User's manual for computer program},
  author = {Wilby, E. G. and Pope, L. D.},
  year = {1985},
  url = {https://ntrs.nasa.gov/citations/19870008969},
  note = {Source identifier: 19870008969}
}