References
- [1] A. Ambrosetti, H. Brézis and G. Cerami, Combined effects of concave and convex nonlinearities in some elliptic problems, J. Funct. Anal. 122 (1994), 519-543.
- [2] G. Bonanno, G. Barletta and D. O'Regan, A variational approach to multiplicity results for boundary-value problems on the real line, Proc. Roy. Soc. Edinburgh Sect. A, 145 (2015), 13-29.
- [3] G. Bonanno, A critical point theorem via the Ekeland variational princi- ple, Nonlinear Anal. 75 (2012), 2992-3007.
- [4] G. Bonanno, Relations between the mountain pass theorem and local min- ima, Adv. Nonlinear Anal. 1 (2012), 205-220.
- [5] G. Bonanno and P. Candito, Non-differentiable functionals and applica- tions to elliptic problems with discontinuous nonlinearities, J. Differential Equations 244 (2008), 3031-3059.
- [6] G. Bonanno and G. D'Aguì, Critical nonlinearities for elliptic Dirichlet problems, Dynam. Systems and Appl. 22 (2013), 411-418.
- [7] G. Bonanno and G. D'Aguì, A critical point theorem and existence results for a nonlinear boundary value problem, Nonlinear Anal. 72 (2010), 1977-1982.
- [8] H. Brézis and E. Lieb, A relation between pointwise convergence of func- tions and convergence of functionals, Proc. Amer. Math. Soc. 88 (1983), 486-490.
- [9] H. Brézis and L. Nirenberg, Positive solutions of nonlinear elliptic equa- tions involving critical Sobolev exponent, Comm. Pure Appl. Math. 36 (1983), 437-477.
- [10] J. Chabrowski, Variational methods for potential operator equations, de Gruyter, Berlin, 1997.
- [11] S. I. Pohozaev, Eigenfunctions of the equation ffu + fff(u) = 0, Soviet Math. Doklady 6 (1965), 1408-1411.
- [12] B. Ricceri, A general variational principle and some of its applications, J. Comput. Appl. Math. 113 (2000), 401-410.
- [13] M. Struwe, Variational Methods, Springer-Verlag, Berlin, 1996.
- [14] M. Willem, Minimax theorems, Birkhäuser, Berlin, 1996.