@article{KVANT_2020_8_a4,
     author = {K. Knop},
     title = {{\CYRV}{\cyro}{\cyrl}{\cyrsh}{\cyre}{\cyrb}{\cyrn}{\cyri}{\cyrk}{\cyri}
},
     journal = {Kvant},
     pages = {41--44},
     publisher = {mathdoc},
     number = {8},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2020_8_a4/}
}