Strongly indefinite functionals with perturbed symmetries and multiple solutions of nonsymmetric elliptic systems. Clapp, Mónica; Ding, Yanheng; Hernández-Linares, Sergio — 2004 Electronic Journal of Differential Equations (EJDE) [electronic only]
Multiple solutions for a singular semilinear elliptic problems with critical exponent and symmetries. Cano, Alfredo; Hernández-Linares, Sergio; Hernández-Martínez, Eric — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]