@misc{MP_2018_a20,
     title = {{\CYRU}{\cyrs}{\cyrl}{\cyro}{\cyrv}{\cyri}{\cyrya} {\cyrz}{\cyra}{\cyrd}{\cyra}{\cyrch}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {231--236},
     publisher = {mathdoc},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_2018_a20/}
}