@misc{indiciae0499c42836f3,
  title = {Sub-optimal closed-loop control of nonlinear systems using invariant imbedding techniques.},
  author = {Melsa, J. L. and Steinway, W. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690056689},
  note = {Source identifier: 19690056689}
}