%0 Journal Article
%A B. A. Bubnov
%T Boundary value problems for a symmetric system of first-order equations
%J Doklady Akademii Nauk
%D 1976
%P 753-756
%V 226
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_226_4_a2/
%G ru
%F DAN_1976_226_4_a2