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[1] Izymova D. V.: On the conditions of oscilìation and nonoscillation of solutions of nonlinear second order differential equations. Диффepeнциaльныe ypaвнeния, 2 (1966), 1572-1586.
[2] Wong J. S. W.: On second order nonlinear oscillation. Math. Research Cеntеr Univеrsity of Wisconsin Tеchnical Rеport no. 836, Also Funkcial Ekvac. 11 (1969), 207-234. MR 0245915 | Zbl 0184.12202
[3] Pavol Marušiak: Notе on thе Ladas' papеr on oscillation and asymptotic bеhaviour of solutions of diffеrеntial еquations with rеtardеd argumеnt. Journal of Difîerential Equations, 13, 150-156(1973). MR 0355266
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