%0 Journal Article
%A B. N. Rachajsky
%T On a variant in the theory of characteristics for systems of first order partial differential  equations
%J Matematički vesnik
%D 1967
%P 329 
%V 19
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MV_1967_19_3_a20/
%F MV_1967_19_3_a20