%0 Journal Article %A Joachim Escher %T Nonlinear elliptic systems with dynamic boundary conditions. %J Mathematische Zeitschrift %D 1992 %P 413-440 %V 210 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1992__210_1_174410/ %F MZ_1992__210_1_174410