@misc{indiciae488183b439aa,
  title = {Stability, controllability and observability of linear matrix-second-order systems},
  author = {Hughes, P. C. and Skelton, R. E.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800040060},
  note = {Source identifier: 19800040060}
}