1. Lee, E. B., and Markus, L., Foundations of Optimal Control Theory, Wiley New York, New York, 1967.
2. Barnett, S., Introduction to Mathematical Control Theory, Clarendon Press, Oxford, England, 1975.
3. Krasovsky, N. N., Theory of Motion Control: Linear Systems, Nauka, Moscow, Russia, 1973.
4. Seriya Fiziko-Matematicheskaya;S. A. Aysagaliev,1985
5. Samoilenko, A. M., and Perestyuk, N. A., Impulsive Differential Equations, World Scientific, Singapore, Republic of Singapore, 1995.