@misc{KVANT_2021_2_a7,
     title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} {{\CYRM}2638{\textendash}{\CYRM}2641,} {{\CYRF}2645{\textendash}{\CYRF}2648}},
     journal = {Kvant},
     pages = {18--19},
     publisher = {mathdoc},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2021_2_a7/}
}