@misc{indiciaed6f4f96dca6c,
  title = {A criterion for vortex breakdown},
  author = {Spall, R. E. and Gatski, T. B. and Grosch, C. E.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880033619},
  note = {Source identifier: 19880033619}
}