Existence and multiplicity of nontrivial solutions for double resonance semilinear elliptic problems. El Amrouss, Abdel R. — 2002 Electronic Journal of Differential Equations (EJDE) [electronic only]
Nontrivial solutions for nonlinear elliptic problems via Morse theory. Ayoujil, Abdesslem; El Amrouss, Abdel R. — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]
A generalization of Ekeland's variational principle with applications. El Amrouss, Abdel R.; Tsouli, Najib — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]
Note on the nodal line of the p -Laplacian. El Amrouss, Abdel R.; El Allali, Zakaria; Tsouli, Najib — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]
Existence of two nontrivial solutions for semilinear elliptic problems. El Amrouss, Abdel R.; Moradi, Fouzia; Moussaoui, Mimoun — 2006 Electronic Journal of Differential Equations (EJDE) [electronic only]