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2. Optimum megawatt-frequency control of multiarea electric systems;Elgerd;IEEE Trans.,1970
3. The megawatt-frequency control problem: a new approach via optimal control theory;Fosah;IEEE Trans.,1970
4. Optimal load frequency continuous control with unknown deterministic power demand;Miniesy;IEEE Trans.,1972
5. On self-tuning regulators;Aström;Automatica,1973