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This paper is devoted to the study of the oscillatory and nonoscillatory behavior of even order nonlinear functional differential equations with deviating argument of the type ( p(t)|x(n)(t)|α sgnx(n)(t)(n) +q(t)|x(g(t))|β sgnx(g(t)) = 0. (Ag) Mathematics subject classification (2010): 34C10, 26A12.

Oscillation and nonoscillation criteria for even order nonlinear functional differential equations