1. “Conditions for Positive and Nonnegative Definiteness in terms of Pseudoinverses,”;Albert;SIAM J. Appl. Math.,1969
2. “Linear Filtering for Time-Varying Systems Using Measurements Containing Colored Noise,”;Bryson;IEEE Trans. Automat Contr.,1965
3. “A Proof of the Minimal Order Observer,”;Dwarakanath;IEEE Trans. Automat. Contr.,1982
4. “On Stochastic Observer-Estimation for Continuous- Time Systems,”;Fairman;IEEE Trans. Automat. Contr.,1977
5. “Reduced Order Optimal State Estimator for Linear Systems with Partially Noise-Corrupted Measurements,”;Fogel;IEEE Trans. Automat. Contr.,1980