@misc{KVANT_2017_11_a11,
     title = {{\CYRZ}{\cyra}{\cyrd}{\cyra}{\cyrch}{\cyri} 9--12},
     journal = {Kvant},
     pages = {39},
     publisher = {mathdoc},
     number = {11},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2017_11_a11/}
}