1. [1] W. Heisenberg, Physics and Philosophy. The Revolution in Modern Science, London, Great Britain: George Allen & Unwin, 1958.
2. [2] D. Hilbert, Grundzüge Einer Allgemeinen Theorie der Linearen Integralgleichungen, Leipzig und Berlin, Germany: Druck und Verlag von B.G.Teubner,1912.
3. [3] N.N. Krasovskii, and A.I. Subbotin, Game-Theoretical Control Problems, New York, USA: Springer, 1988.
4. [4] L.S. Pontryagin, V.G. Boltyanskii, R.V. Gamkrelidze, and E.F. Mishchenko, The Mathematical Theory of Optimal Processes, New York, USA: John Wiley & Sons, 1962.
5. [5] J. Warga, Optimal Control of Differential and Functional Equations, New York, USA: Academic Press, 1972.