@misc{indiciae4aaf83375978,
  title = {Digital flight control design for a tandem-rotor helicopter},
  author = {Stengel, R. F. and Broussard, J. R. and Berry, P. W.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770057223},
  note = {Source identifier: 19770057223}
}