@article{DM_2004_16_2_a5,
     author = {V. B. Alekseev},
     title = {On the number closure-type mappings},
     journal = {Diskretnaya Matematika},
     pages = {85--97},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2004_16_2_a5/}
}