@misc{indiciae7a6bd0ffb9ee,
  title = {Development of a perturbation generator for vortex stability studies},
  author = {Riester, J. E. and Ash, Robert L.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910010066},
  note = {Source identifier: 19910010066}
}