%0 Journal Article
%A S. Baizaev
%A È. Muhamadiev
%T On the index of first-order elliptic operators in the plane
%J Differencialʹnye uravneniâ
%D 1992
%P 818-827
%V 28
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1992_28_5_a9/
%G ru
%F DE_1992_28_5_a9