@article{KVANT_2016_4_a4,
     author = {I. Akulich and V. Dubrovsky},
     title = {{\CYRK}{\cyra}{\cyrm}{\cyre}{\cyrn}{\cyrsftsn} {\cyrv} $\pi$-{\cyro}{\cyrg}{\cyro}{\cyrr}{\cyro}{\cyrd}},
     journal = {Kvant},
     pages = {35--38},
     publisher = {mathdoc},
     number = {4},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KVANT_2016_4_a4/}
}