[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 |
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[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