@article{VMUMM_2019_4_a5,
     author = {T. D. Kozlovskaya},
     title = {Union of $U_r$-sets for the system of characters of the group of $p$-adic numbers},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {42--46},
     publisher = {mathdoc},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2019_4_a5/}
}