%0 Journal Article
%A I. S. Belov
%T Subharmonicity of the powers of the modulus of the gradient of a~harmonic function
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1976
%V 31
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1976_31_4_a13/
%G ru
%F RM_1976_31_4_a13