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4, 0 < \mu \int _0^u {g(s)ds \le g(u)u}$$ ), the boundedness of Palais–Smale sequence becomes a major difficulty in proving the existence of a positive solution. Also, the fact that the function $$g(s)/{s^3}$$ is not increasing for $$s > 0$$ prevents us from using the Nehari manifold directly as usual. Our result extends the main result in He et al. [18] concerning the existence and concentration of positive solutions to the case where $$f(u) \sim |u{|^{p - 2}}u$$ with $$4 < p < 6$$ .
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