@article{PDM_2013_1_a10,
     author = {D. M. Murin},
     title = {On the upper bound for the density of any injective vector},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {117--124},
     publisher = {mathdoc},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2013_1_a10/}
}