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In this work, we present sufficient conditions for oscillation of all solutions of a second-order functional differential equation. We consider two special cases when γ > β $\gamma >\beta $ and γ < β $\gamma <\beta $ . This new theorem complements and improves a number of results reported in the literature. Finally, we provide examples illustrating our results and state an open problem.

Explicit criteria for the oscillation of second-order differential equations with several sub-linear neutral coefficients