%0 Journal Article
%A A. DOUGLIS
%T On Weak Solutions of Non-Linear Partial Differential Equations with Real Characteristics.
%J Mathematische Annalen
%D 1966
%P 351-358
%V 163
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1966__163_161378/
%F MAN_1966__163_161378