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2. On the design of P-I-D controllers using optimal linear regulator theory;Athans;Automatica,1971
3. The role and use of the Linear-Quadratic-Gaussian problem in control system design;Athans;IEEE Trans. Automat. Control,1971
4. The discrete time Linear-Quadratic-Gaussian stochastic control problem;Athans;Ann. Econ. Social Measurement,1972