%0 Journal Article
%A Yu. F. Strugov
%T On a differential property of an extremal mapping quasi-conformal in the mean
%J Doklady Akademii Nauk
%D 1978
%P 1138-1141
%V 243
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1978_243_5_a11/
%G ru
%F DAN_1978_243_5_a11