@article{MP_1957_2_1_a4,
     author = {W. Servais},
     title = {{\CYRP}{\cyrr}{\cyre}{\cyrp}{\cyro}{\cyrd}{\cyra}{\cyrv}{\cyra}{\cyrn}{\cyri}{\cyre} {\cyrm}{\cyra}{\cyrt}{\cyre}{\cyrm}{\cyra}{\cyrt}{\cyri}{\cyrk}{\cyri} {\cyrv}~{\cyrs}{\cyrr}{\cyre}{\cyrd}{\cyrn}{\cyri}{\cyrh} {\cyrsh}{\cyrk}{\cyro}{\cyrl}{\cyra}{\cyrh} {({\CYRD}{\cyro}{\cyrk}{\cyrl}{\cyra}{\cyrd}} {\cyrn}{\cyra} {\cyrk}{\cyro}{\cyrn}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyri}. {{\CYRP}{\cyre}{\cyrr}{\cyre}{\cyrv}{\cyro}{\cyrd}} {\cyrs}~{\cyrf}{\cyrr}{\cyra}{\cyrn}{\cyrc}{\cyru}{\cyrz}{\cyrs}{\cyrk}{\cyro}{\cyrg}{\cyro} {{\CYRM}.} {3.~{\CYRK}{\cyra}{\cyrt}{\cyre}{\cyrr}{\cyra})}},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {22--31},
     year = {1957},
     volume = {Ser. 2, 1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_1957_2_1_a4/}
}