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[2] A. Ambrosetti and A. Malchiodi. Nonlinear Analysis and semilinear elliptic
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[3] A. Ambrosetti and G. Prodi. A primer in nonlinear analysis. Cambridge
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[4] D. G. de Figueiredo. Positive solutions of semilinear elliptic problems.
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[5] J. Hernández. Qualitative methods for nonlinear diffusion equations. 
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[1]  P. H. Rabinowitz. Minimax methods in critical point theory with applications to differential equations. C.B.M.S., Amer Math. Soc., 1986.