%0 Journal Article
%A S. L. Krushkal'
%T On the theory of extremal problems for quasi-conformal mappings of closed Riemann surfaces
%J Doklady Akademii Nauk
%D 1966
%P 784-787
%V 171
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_171_4_a5/
%G ru
%F DAN_1966_171_4_a5