1. Some remarks on a system of quasilinear elliptic equations;Boccardo;Nonlinear Differ. Eqs. Appl.,2002
2. An approach to symmetrization via polarization;Brock;Trans. AMS,1999
3. D.G. de Figueiredo, Semilinear elliptic systems, in: Nonlinear Functional Analysis and Applications to Differential Equations, Trieste, 1997, pp. 122–152 (World Scientific, River Edge, NJ, 1998).
4. Quasilinear elliptic systems of resonant type and nonlinear eigenvalue problems;de Napoli;Abstr. Appl. Anal.,2002
5. Multiple solutions for a perturbed system on strip-like domains;Kristály;Discrete Contin. Dyn Ser.,2012