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Further results on small-controllability of a class of Hammerstein-nonlinear systems

In this paper, small-controllability of a class of Hammerstein-nonlinear systems is studied. By establishing a characteristic equation, sufficient conditions for the systems to be small-controllable are presented, which extend some recent results. In addition, necessary conditions for small-controllability of the systems are also obtained. Finally, examples are given to illustrate the results of this paper.