1. Jury, E.I.: Sampled-data control systems, (John Wiley, New York 1958)
2. Ragazzini, J., and Franklin, G.: Sampled data control systems, (McGraw-Hill, New York 1959)
3. Tou, J.: Digital and sampled data control systems, (McGraw-Hill, New York 1959)
4. Iserman, R.: Digital control systems, (Springer Verlag, Berlin 1981)