@article{MP_2021_a17,
     author = {A. Ya. Kanel-Belov and I. V. Mitrofanov},
     title = {{\CYRU}{\cyrs}{\cyrl}{\cyro}{\cyrv}{\cyri}{\cyrya} {\cyrz}{\cyra}{\cyrd}{\cyra}{\cyrch}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {233--236},
     publisher = {mathdoc},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_2021_a17/}
}