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[1] O. Borůvka: Linear Differential Transformations of the Second Order. The English Universities Press Ltd., London 197L MR 0463539
[2] P. Hartman: Ordinary differential equations. (in Russian), Moscow 1970. Zbl 0214.09101
[3] K. S. Miller: Linear Differential Equations in the Real Domain. New York, W. W. Norton Company, 1963. MR 0156014
[4] S. Staněk: Asymptotic properties of the dispersions of the differential equations y" = q(t)y. Arch. Math. 2 (Brno), XI (1975), 85-98. MR 0407379
[5] C. A. Swanson: Comparison and Oscillation Theory of Linear Differential Equations. Academic Press New York and London 1968. MR 0463570 | Zbl 0191.09904
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