@misc{indiciaee6c1680239ae,
  title = {Shadowgraphs Of Helicopter-Rotor-Tip Vortexes},
  author = {Parthasarathy, Shakkottai P. and Cho, Young I. and Back, Lloyd H.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19880000429},
  note = {Source identifier: 19880000429}
}