@article{DM_2016_28_3_a7,
     author = {P. V. Roldugin},
     title = {Cardinality of subsets of the residue group with nonunit differences of elements},
     journal = {Diskretnaya Matematika},
     pages = {111--125},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2016_28_3_a7/}
}