%0 Journal Article %A Fiacca, Antonella %A Servadei, Raffaella %T Extremal solutions for nonlinear neumann problems %J Discussiones Mathematicae. Differential Inclusions, Control and Optimization %D 2001 %P 191-206 %V 21 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMDICO_2001_21_2_a2/ %G en %F DMDICO_2001_21_2_a2