References
- Bartsch T, Dancer N, Wang Z. A Liouville theorem, a-priori bounds, and bifurcating branches of positive solutions for a nonlinear elliptic system. Calc. Var. 2010;37:345–361.
- Sato Y, Wang Z. On the multiple existence of semi-positive solutions for a nonlinear Schrödinger system. Ann. I.H. Poincaré-AN. 2013;30:1–22.
- Carl S, Heikkilä S. Fixed point theory in ordered sets and applications. From differential and integral equations to game theory. New York (NY): Springer; 2011.
- Carl S, Le VK, Motreanu D. Nonsmooth variational problems and their inequalities. Comparison principles and applications. New York (NY): Springer; 2007.
- Carl S, Motreanu D. Constant-sign and sign-changing solutions for nonlinear eigenvalue problems. Nonlinear Anal. 2008;68:2668–2676.
- Carl S, Motreanu D. Multiple and sign-changing solutions for the multivalued p-Laplacian equation. Math. Nachr. 2010;283:965–981.
- Cuesta M, de Figueiredo D, Gossez J-P. The beginning of the Fucik spectrum for the p-Laplacian. J. Differ. Equ. 1999;159:212–238.
- Vazquez JL. A strong maximum principle for some quasilinear elliptic equations. Appl. Math. Optim. 1984;12:191–202.
- Clarke FH. Optimization and nonsmooth analysis. New York (NY): Wiley; 1983.
- Motreanu D, Zhang Z. Constant and sign changing solutions for systems of quasilinear elliptic equations. Set-Valued Var. Anal. 2011;19:255–269.
- Carl S. Addendum to: variational approach to noncoercive systems of elliptic variational inequalities via trapping region. Complex Var. Elliptic Equ. 2012;57:921–924.
- Carl S. Variational approach to noncoercive systems of elliptic variational inequalities via trapping region. Complex Var. Elliptic Equ. 2012;57:169–183.
- Lieberman G. Boundary regularity for solutions of degenerate elliptic equations. Nonlinear Anal. Theory Methods Appl. 1988;12:1203–1219.
- Garcia Azorero JP, Manfredi J, Peral Alonso I. Sobolev versus Hölder local minimizers and global multiplicity for some quasilinear elliptic equations. Comm. Contemp. Math. 2000;2:385–404.
- Motreanu D, Motreanu VV, Papageorgiou NS. Topological and variational methods with applications to nonlinear boundary value problems. New York (NY): Springer; 2014.