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3. G.F. Franklin, D.J. Powell, A. Emami-Naeini, Feedback Control of Dynamic Systems (Addison-Wesley, Reading, MA, 1994)
4. B.C. Kuo, Automatic Control Systems, 7th edn. (Prentice Hall, Englewood Cliffs, NJ, 1995)
5. F.H. Raven, Automatic Control Engineering (McGraw-Hill, New York, 1995)