TY  - RPRT
TI  - Upper and lower covariance bounds for perturbed linear systems
AU  - Xu, J.-H.
AU  - Skelton, R. E.
AU  - Zhu, G.
PY  - 1990
UR  - https://ntrs.nasa.gov/citations/19900064037
ID  - 19900064037
ER  -