%0 Journal Article
%A V. E. Kashkakha
%T On the zeros of the gradient of the solutions of second-order homogeneous elliptic equations in the plane
%J Doklady Akademii Nauk
%D 1971
%P 523-525
%V 199
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1971_199_3_a3/
%G ru
%F DAN_1971_199_3_a3