@article{DE_1984_20_9_a19,
     author = {H. Sh. Pham},
     title = {Duality in convex multivalued discrete systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1611--1620},
     year = {1984},
     volume = {20},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_9_a19/}
}