Review of "Kalman-Bucy Filter-Deterministische Beobachtung und Stochastische Filterung" (Kalman-Bucy Filter-Deterministic Observing and Stochastic Filtering) by Karl Brammer and Gerhard Siffling.
V. Krebs. IEEE Trans. Syst. Man Cybern., 6 (9):
655-656(1976)