@misc{indiciae201c846a5552,
  title = {Rotorcraft noise: Status and recent developments},
  author = {George, Albert R. and Sim, Ben WEL-C. and Polak, David R.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940016050},
  note = {Source identifier: 19940016050}
}