The existence of infinitely many solutions for a mixed boundary value problem is established. The approach is based on variational methods.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ap99-3-5, author = {Gabriele Bonanno and Elisabetta Tornatore}, title = {Infinitely many solutions for a mixed boundary value problem}, journal = {Annales Polonici Mathematici}, volume = {98}, year = {2010}, pages = {285-293}, zbl = {1208.34021}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap99-3-5} }
Gabriele Bonanno; Elisabetta Tornatore. Infinitely many solutions for a mixed boundary value problem. Annales Polonici Mathematici, Tome 98 (2010) pp. 285-293. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap99-3-5/