@misc{indiciae25346f0bb30b,
  title = {Digital adaptive controllers for VTOL vehicles. Volume 1: Concept evaluation},
  author = {Hartmann, G. L. and Stein, G. and Pratt, S. G.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800007805},
  note = {Source identifier: 19800007805}
}