%0 Journal Article
%A L. I. Kamynin
%A B. N. Khimchenko
%T An isotropic strict extremum principle in a planar domain
%J Differencialʹnye uravneniâ
%D 1979
%P 1296-1306
%V 15
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1979_15_7_a14/
%G ru
%F DE_1979_15_7_a14