Reference
E. B. Lee andL. Markus,Foundations of Optimal Control Theory, Wiley, New York, 1967.
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Hàjek, O. Cores of targets in linear control systems. Math. Systems Theory 8, 203–206 (1974). https://doi.org/10.1007/BF01762667
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DOI: https://doi.org/10.1007/BF01762667