@misc{indiciae4b1040cff282,
  title = {Forward rotor vortex effects on counter rotating propeller noise},
  author = {Laur, Michele and Squires, Becky and Nagel, Robert T.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930035224},
  note = {Source identifier: 19930035224}
}