1. M. Athans and P. Falb,Optimal Control, McGraw-Hill: New York, 1966.
2. A. Johnson, “The discrete and sampled-data deterministic control problems,”Proc. IASTED Modelling, Identification and Control Symposium, Innsbruck, pp. 134–137, 1991.
3. A. Johnson, “Discrete and sampled-data stochastic control problems with complete and incomplete state information,”J. Appl. Math. Optim., vol. 24, pp. 289–316, 1991.
4. A. H. Levis, R.A. Schleuter and M. Athans, “On the behaviour of optimal linear sampled-data regulators,”Int. J. Control, vol. 13, no. 2, pp. 343–361, 1971.
5. F.L. Lewis,Optimal Control, John Wiley: New York, 1986.