@misc{indiciae9e6e547ec7cd,
  title = {Personal propulsion unit Patent},
  author = {Barrett, T. W. and Croft, R. M. and Orillion, A. G.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710018109},
  note = {Source identifier: 19710018109}
}