TY - JOUR AU - Graham H. Williams TI - Lipschitz Continuous Solutions for Nonlinear Obstacle Problems. JO - Mathematische Zeitschrift PY - 1977 SP - 51 EP - 66 VL - 154 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZ_1977__154_172507/ ID - MZ_1977__154_172507 ER -