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2. B. Ricceri, A three critical points theorem revisited, Nonlinear Anal., in press (doi:10.1016/j.na.2008.04.010)
3. Existence of three solutions for a class of elliptic eigenvalue problems;Ricceri;Math. Comput. Modelling,2000
4. Sublevel sets and global minima of coercive functionals and local minima of their perturbations;Ricceri;J. Nonlinear Convex Anal.,2004
5. A class of functionals on a Banach space for which strong and weak local minima do coincide;Naselli;Optimization,2001