@article{VMUMM_1987_6_a11,
     author = {V. A. Nikiforov},
     title = {Extension of a selection for a multivalued mapping, and the {Eilenberg--Borsuk} duality theorem},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {57--59},
     publisher = {mathdoc},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1987_6_a11/}
}