%0 Journal Article %A V. L. Levin %T On duality theory for non-topological variants of the~mass transfer problem %J Sbornik. Mathematics %D 1997 %P 571-602 %V 188 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1997_188_4_a2/ %G en %F SM_1997_188_4_a2