1. Infinitely many solutions for a class of sublinear Schrödinger equations with sign-changing potentials;Bahrouni;Proc. Roy. Soc. Edinburgh Sect. A,2015
2. Three solutions for strongly resonant elliptic problem;Goncalves;Nonlinear Anal.,1995
3. Elliptic Partial Differential Equations;Han,1997
4. Variational Methods;Struwe,1990
5. Positive solutions of semilinear elliptic equations with small perturbations;Kajikiya;Proc. Amer. Math. Soc.,2013