1. S.P. Banks, On the optimal control of nonlinear systems. Syst. Control Lett. 6, 337–343 (1986)
2. M. Athans, P.L. Falb, Optimal Control: An Introduction to the Theory and Its Applications (McGraw-Hill, New York, 1966)
3. T. Cimen, Survey of state—dependent Riccati Equation in non linear optimal feedback control synthesis. J. Guid. Control Dyn. 35(4), 1025–1047 (2012)
4. A.K. Nanda Kumaran, Calculus of variation to optimal control. Lecture notes at Winter School on Stochastic Analysis and Control of Fluid Flow (Department of Mathematics, IISER, Trivandrum, 3–20 December, 2012), pp. 1–23
5. B.D.O. Aderson, J.B. Moore, Optimal Control (Prentice Hall of India Private Limited, 2004)