1. Quasilinearization and nonlinear boundary value problems;Bellman,1965
2. Numerical identification of linear dynamic systems from normal operating records;Åström,1966
3. Periodicities of open linear systems with positive steady states;Rapaport;Bull. Math. Biophys.,1952
4. Automatic construction of linear stochastic dynamic models for stationary industrial processes with random disturbances using operating records;Åström,1965
5. Lectures on the identification problem—The least squares method;Åström,1968