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On the Oscillation of Solutions of the Equation $d^mu/dt^m + a(t)|u|^m \sign u = 0$. Matem. Sborn., 2, 1964, 172-187 (Russian).
MR 0173060 |
Zbl 0135.14302
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[5] MARUŠlAK P.:
Oscillation of Solutions of Nonlinear Delay Differential Equations. Mat. Čas., 4, 1974, 371-380.
MR 0399620
[6] ODARICH O. N.:
On Asymptotic Behavior of Solutions of Nonlinear Differential Second Order Delay Equation. Dopov. AN URSR 8, 1968, 712-715 (Ukrainian).
MR 0249765
[7] ODARICH O. N., SHEVELO V. N.: On Asymptotic Behavior of Monotonous Solutions of Nonlinear Differential Second Order Delay Equations. Dopov. AN URSR 12, 1971, 1072-1075 (Ukrainian).
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