@misc{indiciae39cdf8668773,
  title = {Practical optimal flight control system design for helicopter aircraft. Volume 1: Technical Report},
  author = {Hofmann, L. G. and Riedel, S. A. and Mcruer, D.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800014839},
  note = {Source identifier: 19800014839}
}