%0 Journal Article %A Giuseppe Cordaro %T Multiple solutions to a perturbed Neumann problem %J Studia Mathematica %D 2007 %P 167-175 %V 178 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm178-2-3/ %R 10.4064/sm178-2-3 %G en %F 10_4064_sm178_2_3