@article{SM_1997_188_4_a2,
     author = {V. L. Levin},
     title = {On duality theory for non-topological variants of the~mass transfer problem},
     journal = {Sbornik. Mathematics},
     pages = {571--602},
     publisher = {mathdoc},
     volume = {188},
     number = {4},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1997_188_4_a2/}
}