TY - JOUR AU - J. Szarski TI - On an overdetermined system of non-linear partial differential equations of the first order JO - Colloquium Mathematicum PY - 1967 SP - 119 EP - 124 VL - 18 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-18-1-119-124/ DO - 10.4064/cm-18-1-119-124 LA - en ID - 10_4064_cm_18_1_119_124 ER -