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References:
[1] Е. A. Coddington N. Levinson: Theory of ordinary differential equations. McGraw-Hill 1955. MR 0069338
[2] S. Lefschetz: Differential equations, Geometric theory. Interscience Publisheгs, New York 1957. MR 0094488 | Zbl 0080.06401
[3] J. Kučera I. Vrkoč: Note on stability of a control system. Časopis pro pӗst. matematiky 93, (1968), 472-479. MR 0241768
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