1. M. Ahtnas and P. L. Falb, Optimal Control, McGraw-Hill Publish. Comp., Maidenhead, Berksh. (1966).
2. I. Flugge–Lotz and H. Marbach, “The optimal control of some attitude control systems for different performance criteria,” J. Basis Eng. 85, 165–176 (1963).
3. A. V. Balakrishnan and L. W. Neustadt, Computing Methods in Optimization Problems, Academic Press, New York (1964).
4. N. Z. Ragab, “Time fuel optimal decoupling control problem,” Adv. Model. Simul. 22, No. 2, 1–16 (1990).
5. J. Redmond and L. Silverberg, “Fuel consumption in optimal control,” J. Guid. Control Dyn. 15, No. 2, 424–430 (1992).