%0 Journal Article
%A G. V. Zhidkov
%T Differential properties of functions on the sphere
%J Differencialʹnye uravneniâ
%D 1983
%P 2090-2101
%V 19
%N 12
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1983_19_12_a9/
%G ru
%F DE_1983_19_12_a9