On the focal points of solutions of a certain fourth order differential equation
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 25 (1986) no. 1, pp. 97-115 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Vlček, Vladimír. On the focal points of solutions of a certain fourth order differential equation. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 25 (1986) no. 1, pp. 97-115. http://geodesic.mathdoc.fr/item/AUPO_1986_25_1_a5/

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[2] Borůvka O.: Lineare Differentialtransformationen 2. Ordnung. VEB Deutscher Verlag der Wissenschaften, Berlin, 1967 | MR | Zbl

[3] Vlček V.: On a distribution of zeros of solutions of a fourth-order iterated linear differential equation. Acta UP Olom., F. R. N., Tom 57, 1978 | MR | Zbl