@misc{indiciae20a9535233c3,
  title = {Progress report on propeller aircraft flyover noise research},
  author = {Metzger, F. B. and Magliozzi, B. and Pegg, R. J.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760048988},
  note = {Source identifier: 19760048988}
}