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3. M. G. Krein, ?The ideas of P. L. Chebyshev and A. A. Markov in the theory of the limit values of integrals and their further develoment,? Usp. Mat. Nauk,6, No. 4, 3?120 (1951).
4. N. I. Akhiezer, The Classical Moment Problem, American Mathematical Society, Providence, R. I. (1962).
5. N. N. Krasovskii, The Theory of Controlling Motions [in Russian], Nauka, Moscow (1968).