@misc{indiciae0298fd69112e,
  title = {Progress in Air Separation with the Vortex Tube},
  author = {Balepin, Vladimir and Petley, Dennis and Rosholt, Douglas},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20000012624},
  note = {Source identifier: 20000012624}
}