@article{KVANT_2021_7_a22,
     author = {E. Epifanov},
     title = {{\CYRP}{\cyrya}{\cyrt}{\cyrsftsn} {\cyrk}{\cyru}{\cyrb}{\cyro}{\cyrv}},
     journal = {Kvant},
     pages = {1},
     year = {2021},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2021_7_a22/}
}