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3. On the “bang-bang” control problem;Bellman;Quart. Appl. Math.,1956
4. Theory of time-optimal processes for linear systems;Gamkrelidze;Izv. Akad. Nauk S.S.S.R., Ser. Mat.,1958
5. A Note on the Range of a Vector Measure: Application to the Theory of Optimal Control;Hermes;RIAS TR 63-3,1963