1. A remark on multiplicity of solutions for semilinear elliptic problems with indefinite nonlinearity;Badiale;C.R. Acad. Sci. Paris, Ser. I,1996
2. Extrema problems with critical Sobolev exponents on unbounded domains;Ben-Naoum;Nonlinear Anal. TMA,1996
3. A perturbation theorem for the equation −Δ u+λ u=up in unbounded domains;Dall'aglio;Nonlinear Anal. TMA,1997
4. Local mountain passes for semilinear elliptic problems in unbounded domain;del Pino;Calc. Var. PDE,1996
5. H. Jesus, Positive solutions for the logistic equation with unbounded weights, in: G. Caristi, E. Mitidieri (Eds.), Reaction Diffusion Systems, Lecture Notes in Pure and Applied Mathematics, Vol. 194, Dekker, New York, 1998, pp. 183–197.