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The authors consider the semilinear Schrdinger equation -△Au + Vλ(x)u = Q(x)|u|γ-2u in RN, where 1 < γ < 2* and γ = 2, Vλ = V + - λV -. Exploiting the relation between the Nehari manifold and fibrering maps, the existence of nontrivial solutions fo