@misc{indiciaeee172dd06b3f,
  title = {A method for determining internal noise criteria based on practical speech communication applied to helicopters},
  author = {Sternfeld, H., Jr. and Doyle, L. B.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19790002678},
  note = {Source identifier: 19790002678}
}