1. Athans, M. and Falb, P., Optimal Control, McGraw Hill, 1966.
2. Flugge-Lotz, I. and Marbach, H., The Optimal Control of Some Attitude Control Systems for Different Performance Criteria, J. Basis Eng., 1963, vol. 85, pp. 165–176.
3. Balakrishnan, A.V. and Neustadt, L.W., Computing Methods in Optimization Problems, New York: Academic Press, 1964.
4. Ragab, M.Z., Time Fuel Optimal Decoupling Control Problem, Adv. Model. Simul., 1990, vol. 22, no. 2, pp. 1–16.
5. Redmond, J. and Silverberg, L., Fuel Consumption in Optimal Control, J. Guid. Control Dyn., 1992, vol. 15, no. 2, pp. 424–430.