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3. Estimation of noise-covariance matrices for a linear time-varying stochastic process;Bélanger;Proc. 5th IFAC World Congress, Paris,1972
4. Information pattern for linear discrete-time models with stochastic coefficients;Bohlin;IEEE Trans. Autom. Control,1970
5. Analysis of stationary EEG-signals by the maximum likelihood and generalized least-squares methods;Bohlin,1971