%0 Journal Article
%A A. Dzhuraev
%A È. Muhamadiev
%T On the normal solvability and index of first-order systems of composite type
%J Doklady Akademii Nauk
%D 1977
%P 753-756
%V 235
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_235_4_a6/
%G ru
%F DAN_1977_235_4_a6