@misc{indiciaea04e5a1a72a8,
  title = {Low-Noise Operating Mode for Propeller-Driven Electric Airplanes},
  author = {Berton, Jeffrey J. and Nark, Douglas M.},
  year = {2018},
  url = {https://ntrs.nasa.gov/citations/20180005233},
  note = {Source identifier: 20180005233}
}