@misc{MP_2021_3_28_a15,
     title = {{\CYRK} {\cyrs}{\cyrt}{\cyra}{\cyrt}{\cyrsftsn}{\cyre} {{\CYRI}.} {{\CYRE}.} {{\CYRV}{\cyro}{\cyrr}{\cyro}{\cyrb}{\cyrsftsn}{\cyryo}{\cyrv}{\cyra}}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {217--218},
     year = {2021},
     volume = {Ser. 3, 28},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_2021_3_28_a15/}
}