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Some properties of the differential equations \(y''+f(x)|y| = 0\). (Slovak) Zbl 0169.11304

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[4] Ráb M.: Kriterien für die Oszilation der Lősungen der Differentialgleichung [p(x)y’]’ + q(x)y = O. Časopis pro pěstování matematiky 84 (1959), 335-370.
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