@article{MP_2016_3_20_a4,
     author = {G. A. Gal'perin and Ch. Delman},
     title = {{\CYRP}{\cyro}{\cyrv}{\cyre}{\cyrs}{\cyrt}{\cyrsftsn} {\cyro} {\cyrt}{\cyrr}{\cyryo}{\cyrh} {\cyrk}{\cyrr}{\cyru}{\cyrg}{\cyra}{\cyrh}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {111--134},
     year = {2016},
     volume = {Ser. 3, 20},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_2016_3_20_a4/}
}