1. N. N. Krasovskii, Theory of Motion Control (Nauka, Moscow, 1968) [in Russian].
2. R. E. Kalman, P. L. Falb, and M. A. Arbib, Topics in Mathematical System Theory (McGraw-Hill, New York, 1969).
3. E. B. Lee and L. Markus, Foundations of Optimal Control Theory (Wiley, New York, 1967).
4. V. I. Zubov, Lectures on Control Theory (Nauka, Moscow, 1975) [in Russian].
5. S. Walczak, “A note on the controllability of nonlinear systems,” Math. Syst. Theory 17 (4), 351–356 (1984).