@misc{indiciae9b75c03f2cb7,
  title = {Performance deterioration based on existing (historical) data; JT9D jet engine diagnostics program},
  author = {Sallee, G. P.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19800013837},
  note = {Source identifier: 19800013837}
}