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Using localized energy method, we prove that there exists some $\\delta_0$ such that for $0<\\delta<\\delta_0$, the above problem has infinitely many positive solutions. This generalizes and gives a new proof of the results by Cerami-Passaseo-Solimini (CPAM to appear). 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Using localized energy method, we prove that there exists some $\\delta_0$ such that for $0<\\delta<\\delta_0$, the above problem has infinitely many positive solutions. This generalizes and gives a new proof of the results by Cerami-Passaseo-Solimini (CPAM to appear). 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