@misc{indiciae478b2b9b2b7d,
  title = {Rotor noise measurement using a directional microphone array},
  author = {Marcolini, Michael A. and Brooks, Thomas F.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880031430},
  note = {Source identifier: 19880031430}
}