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References:
[1] Borůvka O.: Lineare Differentialgleichungen 2. Ordnung. VEB, DVW, Berlin 1967, 218 pages. MR 0236448
[2] Laitoch M.: A modification of the Sturm’s theorem on separating zeros of solutions of a linear differential equation of the 2nd order. Аcta Univerѕitatiѕ Palackianae Olomucenѕiѕ FRN, Torn 57, 1978. MR 0554033 | Zbl 0429.34011
[3] Hаrtmаn P.: Ordinary differential equations. John Wiley comp. ѕonѕ, New York-London-Ѕydney, 1964. MR 0171038
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