%0 Journal Article %A Graham H. Williams %T Lipschitz Continuous Solutions for Nonlinear Obstacle Problems. %J Mathematische Zeitschrift %D 1977 %P 51-66 %V 154 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1977__154_172507/ %F MZ_1977__154_172507