@misc{indiciae2e5c68eca09f,
  title = {On a criterion for vortex breakdown},
  author = {Spall, R. E. and Gatski, T. B. and Grosch, C. H.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870008595},
  note = {Source identifier: 19870008595}
}