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2. Final-value control of nonlinear composite distributed—and lumped—parameter systems;Tzafestas;J. Franklin Inst.,1970
3. An operator theoretic formulation of a class of control problems and a steepest descent method of solution;Balakrishnan;J. SIAM Control,1963
4. An application of functional analysis to the optimal control problem;Kranc;ASME Trans., J. Basic Engrg,1963
5. On optimal control of systems with multi-norm constraints;Sarashik;2nd IFAC,1963