@article{FAA_2002_36_2_a3,
     author = {V. L. Levin},
     title = {Optimality {Conditions} for {Smooth} {Monge} {Solutions} of the {Monge--Kantorovich} problem},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {38--44},
     publisher = {mathdoc},
     volume = {36},
     number = {2},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_2002_36_2_a3/}
}