@article{MP_1957_2_1_a6,
     author = {Ya. S. Dubnov},
     title = {{\CYRT}{\cyrr}{\cyri}{\cyrg}{\cyro}{\cyrn}{\cyro}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyrya} {\cyrv}~{\cyrsh}{\cyrk}{\cyro}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrm} {\cyrk}{\cyru}{\cyrr}{\cyrs}{\cyre} {\cyrg}{\cyre}{\cyro}{\cyrm}{\cyre}{\cyrt}{\cyrr}{\cyri}{\cyri}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {45--56},
     year = {1957},
     volume = {Ser. 2, 1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_1957_2_1_a6/}
}