%0 Journal Article
%A A. Yanushauskas
%T On the zeros of the gradient of a harmonic function
%J Doklady Akademii Nauk
%D 1964
%P 547-549
%V 158
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1964_158_3_a12/
%G ru
%F DAN_1964_158_3_a12