@misc{indiciae79af543c108a,
  title = {On Betz' Method for Rollup of Vortex Sheets},
  author = {Rossow, Vernon J. and Olson, Lawrence E.},
  year = {1996},
  url = {https://ntrs.nasa.gov/citations/20020041919},
  note = {Source identifier: 20020041919}
}