@misc{indiciae96be9a9bda6a,
  title = {Users manual for program SSFREQ intermediate mode stability curves: Developed for use on a PC computer},
  author = {Armstrong, Wilbur C.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930003487},
  note = {Source identifier: 19930003487}
}