The aim of this paper is to give the proofs of those results that in [4] were only announced, and, at the same time, to propose some possible developments, indicating some of the most significant open problems.
Department of Mathematics, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
Bibliografia
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[3] B. Ricceri, Structure, approximation et dépendance continue des solutions de certaines équations non linéaires, C. R. Acad. Sci. Paris, Série I, 305 (1987), 45-47.
[4] B. Ricceri, A variational property of integral functionals on $L^p$-spaces of vector-valued functions, C. R. Acad. Sci. Paris, Série I, 318 (1994), 337-342.