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4. Korobov VI (1973) Controllability, stability of certain nonlinear systems. Differencial’nye Uravnenija 9:614–619 (Russian) (Engl. Transl.: Differential Equations 9:466–469)
5. Kovalev AM, Scherbak VF (1993) Controllability, observability, identification of dynamical systems. Naukova Dumka, Kyiv (Russian)