@misc{KVANT_2021_1_a11,
     title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 17{\textendash}20},
     journal = {Kvant},
     pages = {41},
     year = {2021},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2021_1_a11/}
}