Szukana fraza: [Abstract = "General results are then applied to a semilinear mechanical flexible\-structure vibratory dynamical system. Some special cases are also considered. Moreover, remarks and comments on the relationships between different concepts of controllability are given. The paper extends the results presented in \(Klamka, 1992\; Triggiani, 1978\) to a more general class of second\-order abstract dynamical systems."]

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