@misc{indiciaead85158a7377,
  title = {Digital controllers for VTOL aircraft},
  author = {Stengel, R. F. and Broussard, J. R. and Berry, P. W.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19770045993},
  note = {Source identifier: 19770045993}
}