@misc{indiciaeffe35320adc0,
  title = {Aircraft noise synthesis system: Version 4 user instructions},
  author = {Mccurdy, David A. and Sullivan, Brenda M. and Grandle, Robert E.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870011364},
  note = {Source identifier: 19870011364}
}