@misc{indiciae3c4984dfa712,
  title = {Low-Noise Operating Mode for Propeller-Driven Electric Airplanes},
  author = {Jeffrey J. Berton and Douglas M. Nark},
  year = {2019},
  url = {https://ntrs.nasa.gov/citations/91664143908910},
  note = {Source identifier: 91664143908910}
}