%0 Journal Article
%A Kolev, Dimitar
%T Involutivity and Symple Waves in R^2
%J Serdica Mathematical Journal
%D 1997
%P 225-232
%V 23
%N 3-4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SMJ2_1997_23_3-4_a3/
%G en
%F SMJ2_1997_23_3-4_a3