@misc{indiciae1868ab2c2b93,
  title = {Acoustic radiation from lined, unflanged ducts: Acoustic source distribution program},
  author = {Beckemeyer, R. J. and Sawdy, D. T.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19750020776},
  note = {Source identifier: 19750020776}
}