TY - JOUR AU - H. Marcinkowska TI - On the differentiability of weak solutions of certain non-elliptic equations II JO - Studia Mathematica PY - 1963 SP - 85 EP - 103 VL - 23 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-23-1-85-103/ DO - 10.4064/sm-23-1-85-103 LA - en ID - 10_4064_sm_23_1_85_103 ER -