@misc{indiciae7dd5616bb78e,
  title = {Observing partial states for systems with unmeasurable disturbances},
  author = {Wang, S.-H. and Davison, E. J.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780058083},
  note = {Source identifier: 19780058083}
}