@misc{indiciae0e23ab04caec,
  title = {Low-noise propulsion systems for subsonic transports},
  author = {Feiler, C. E. and Kramer, J. J. and Leonard, B. R.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700038772},
  note = {Source identifier: 19700038772}
}