@misc{indiciaeecc78b46910d,
  title = {NASA Aircraft Vortex Spacing System Development Status},
  author = {Hinton, David A. and Charnock, James K. and Bagwell, Donald R. and Grigsby, Donner},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20040086826},
  note = {Source identifier: 20040086826}
}