@misc{indiciae5a4247433897,
  title = {An approach to sub-optimal feedback control of non-linear systems.},
  author = {Clark, L. G. and Garrard, W. L. and Mcclamroch, N. H.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670061916},
  note = {Source identifier: 19670061916}
}