@article{DAN_1957_117_1_a25,
     author = {E. M. Usova and E. M. Voroshin},
     title = {{\CYRP}{\cyro}{\cyrp}{\cyrr}{\cyra}{\cyrv}{\cyrk}{\cyri} {\cyrk}~{\cyrs}{\cyrt}{\cyra}{\cyrt}{\cyrsftsn}{\cyre} {``{\CYRK}} {\cyrv}{\cyro}{\cyrp}{\cyrr}{\cyro}{\cyrs}{\cyru} {\cyro}~{\cyrs}{\cyrt}{\cyrr}{\cyro}{\cyre}{\cyrn}{\cyri}{\cyri} {\cyrb}{\cyre}{\cyrn}{\cyrz}{\cyrg}{\cyri}{\cyrd}{\cyrr}{\cyro}{\cyrk}{\cyrs}{\cyra}{\cyrm}{\cyro}{\cyrv}{\cyrery}{\cyrh} {\cyrk}{\cyri}{\cyrs}{\cyrl}{\cyro}{\cyrt} {\cyri} 
},
     journal = {Doklady Akademii Nauk},
     pages = {8},
     publisher = {mathdoc},
     volume = {117},
     number = {1},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_117_1_a25/}
}