TY  - JOUR
AU  - A. DOUGLIS
TI  - On Weak Solutions of Non-Linear Partial Differential Equations with Real Characteristics.
JO  - Mathematische Annalen
PY  - 1966
SP  - 351
EP  - 358
VL  - 163
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1966__163_161378/
ID  - MAN_1966__163_161378
ER  -