@misc{indiciae4388e2c61146,
  title = {On the design of optimal linear systems using only output-variable feedback.},
  author = {Athans, M. and Levine, W. S.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19690039417},
  note = {Source identifier: 19690039417}
}