@misc{indiciaeb33aee2459af,
  title = {Tip-turbine lift package design},
  author = {Jaklitsch, R. and Leto, A. and Pratt, W. and Schaefer, R.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710025469},
  note = {Source identifier: 19710025469}
}