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References:
[1] Hartmann F.: Ordinary Differential Equations. (rus.), Moskva 1970.
[2] Borůvka O.: Lineare Differentialtransformationen 2. Ordnung. VEB Deutscheг Verlag deг Wissеnschaftеn, Berlin 1967.
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[4] Vlček V.: On functions describing a distribution of zeros of solutions of an iterated linear differential equation of the fourth order. Acta UP Olom., F. R. N., (v tisku). Zbl 0452.34028
[5] Kamke E.: Differentialgleichungen I. Gewöhnliche Differentialgleichungen, Leipzig 1969. Zbl 0194.39301
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