@article{KVANT_2018_12_a1,
     author = {I. B. Esipov},
     title = {{\CYRF}{\cyri}{\cyrz}{\cyri}{\cyrk}{\cyra} {\cyrz}{\cyrv}{\cyru}{\cyrk}{\cyra}},
     journal = {Kvant},
     pages = {8--15},
     publisher = {mathdoc},
     number = {12},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2018_12_a1/}
}