@misc{KVANT_2021_4_a9,
     title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri}  {{\CYRM}2646{\textendash}{\CYRM}2649,} {{\CYRF}2653{\textendash}{\CYRF}2656}},
     journal = {Kvant},
     pages = {17--19},
     publisher = {mathdoc},
     number = {4},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2021_4_a9/}
}