%0 Journal Article
%A V. L. Levin
%T A~formula for the optimal value in the Monge--Kantorovich problem with a~smooth cost function, and a~characterization of cyclically monotone mappings
%J Sbornik. Mathematics
%D 1992
%P 533-548
%V 71
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1992_71_2_a16/
%G en
%F SM_1992_71_2_a16