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References:
[1] R. Bellman: Stability Theory of Differential Equations. New York 1953 (Russian transl. I.I. L. Moscow 1954). MR 0075365 | Zbl 0053.24705
[2] O. Borůvka: Linear Differential Transformation of the Second Order. The English Universities Pгess, London 1971. MR 0463539
[3] F. Neuman: Linear differential equations of the second order and their applications. Rend. Mat. 4 (1971), p. 559-617. MR 0311972 | Zbl 0227.34005
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