@misc{indiciae03bbc5f61a7e,
  title = {User's manual for PEPSIG NASA tip vortex version},
  author = {Tsai, Tommy M. and Dejong, Frederick J. and Levy, Ralph},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19900001519},
  note = {Source identifier: 19900001519}
}