%0 Journal Article
%A V. G. Sheretov
%T Tests for extremality in a problem for quasiconformal mappings
%J Matematičeskie zametki
%D 1986
%P 14-23
%V 39
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1986_39_1_a1/
%G ru
%F MZM_1986_39_1_a1