%0 Journal Article
%A V. M. Polyakova
%T Level lines of the solution to an elliptic equation
%J Doklady Akademii Nauk
%D 1961
%P 1259-1262
%V 140
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_140_6_a6/
%G ru
%F DAN_1961_140_6_a6