%0 Journal Article
%A A. Dzhuraev
%T Some first-order nonelliptic overdetermined systems and their
%J Doklady Akademii Nauk
%D 1991
%P 885-891
%V 321
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_321_5_a3/
%G ru
%F DAN_1991_321_5_a3