1. F. L. Lewis, Optimal Control, John Wiley & Sons, NY, 1986.
2. D. E. Kirk, Optimal Control Theory, Prentice Hall, Englewood Cliffs, NJ, 1970.
3. B. D. O. Anderson and J. B. Moore, Optimal Control: Linear Quadratic Methods, Prentice Hall, Englewood Cliffs, NJ, 1990.
4. B. M. Mohan and S. K. Kar, “Optimal control of singular systems via orthogonal functions,” International Journal of Control, Automation, and Systems, vol. 9, no. 1, pp. 145–150, 2011.
5. C. T. Chen, Linear System Theory and Design, Holt, Rinehart and Winston, 1984.