@article{MS_1955__79_2_a0,
     author = {{\CYRI}.{\CYRG}. {\CYRP}{\cyre}{\cyrt}{\cyrr}{\cyro}{\cyrv}{\cyrs}{\cyrk}{\cyri}{\cyrishrt} and {\CYRE}.{\CYRM}. {\CYRL}{\cyra}{\cyrn}{\cyrd}{\cyri}{\cyrs}},
     title = {{\CYRO} {\cyrch}{\cyri}{\cyrs}{\cyrl}{\cyre} {\cyrp}{\cyrr}{\cyre}{\cyrd}{\cyre}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyrc}{\cyri}{\cyrk}{\cyrl}{\cyro}{\cyrv} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} $dy/dx=P(x,y)/Q(x,y)$, {\cyrg}{\cyrd}{\cyre} $P$ {\cyri} $Q$ - {\cyrm}{\cyrn}{\cyro}{\cyrg}{\cyro}{\cyrch}{\cyrl}{\cyre}{\cyrn}{\cyrery} 2-{\cyrishrt} {\cyrs}{\cyrt}{\cyre}{\cyrp}{\cyre}{\cyrn}{\cyri}},
     journal = {Matemati\v{c}eskij sbornik},
     pages = {209--250},
     publisher = {mathdoc},
     volume = {79},
     number = {2},
     year = {1955},
     zbl = {0065.07202},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MS_1955__79_2_a0/}
}