@misc{indiciaeae112d132e5a,
  title = {Thrust Characteristics of Multiple Lifting Jets in Ground Proximity},
  author = {Davenport, Edwin E. and Spreeman, Kenneth P.},
  year = {1960},
  url = {https://ntrs.nasa.gov/citations/20040030507},
  note = {Source identifier: 20040030507}
}