1. The choice of signal-process models in Kalman-Bucy filtering;Anderson;J. Math. Analysis Applic,1971
2. Proceedings of the First Allerton Conference on Circuit and System Theory;Kalman,1963
3. Hyperstability and optimality of automatic systems with several control functions;Popov;Rev. Roum. Sci. Tech.—Electrotechn. et Energ,1964
4. A system theory criterion for positive real matrices;Anderson;SIAM J. Control,1967