@article{MP_1957_2_1_a25,
     author = {E. M. Landis},
     title = {{\CYRI}. {{\CYRG}.~{\CYRP}{\cyre}{\cyrt}{\cyrr}{\cyro}{\cyrv}{\cyrs}{\cyrk}{\cyri}{\cyrishrt}} {\cyri} {{\CYRE}.} {{\CYRM}.~{\CYRL}{\cyra}{\cyrn}{\cyrd}{\cyri}{\cyrs}.} {{\CYRCH}{\cyri}{\cyrs}{\cyrl}{\cyro}} {\cyrp}{\cyrr}{\cyre}{\cyrd}{\cyre}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyrh} {\cyrc}{\cyri}{\cyrk}{\cyrl}{\cyro}{\cyrv} {\cyrd}{\cyri}{\cyrf}{\cyrf}{\cyre}{\cyrr}{\cyre}{\cyrn}{\cyrc}{\cyri}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrg}{\cyro} {\cyru}{\cyrr}{\cyra}{\cyrv}{\cyrn}{\cyre}{\cyrn}{\cyri}{\cyrya} $\frac{dy}{dx}=\frac{P_2(x,y)}{Q_2(x,y)}$},
     journal = {Matematicheskoe Prosveshchenie},
     pages = {213--214},
     year = {1957},
     volume = {Ser. 2, 1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MP_1957_2_1_a25/}
}