@misc{KVANT_2021_5_a14,
     title = {{\guillemotleft}{\CYRK}{\cyrv}{\cyra}{\cyrn}{\cyrt}{\guillemotright} {\cyru}{\cyrl}{\cyrery}{\cyrb}{\cyra}{\cyre}{\cyrt}{\cyrs}{\cyrya}},
     journal = {Kvant},
     pages = {23},
     publisher = {mathdoc},
     number = {5},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2021_5_a14/}
}