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Methods Nonlinear Anal., 2017], when the potential $b \\in L^{\\infty}(\\mathbb{R}^{N})$ may change its sign, $0<a\\in L^{\\frac{2}{1+\\gamma}}(\\mathbb{R}^{N})$, $V$ is a positive continuous function, $N\\geq 3$ and $\\lambda>0$ is a real parameter. 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Methods Nonlinear Anal., 2017], when the potential $b \\in L^{\\infty}(\\mathbb{R}^{N})$ may change its sign, $0<a\\in L^{\\frac{2}{1+\\gamma}}(\\mathbb{R}^{N})$, $V$ is a positive continuous function, $N\\geq 3$ and $\\lambda>0$ is a real parameter. 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