@misc{DE_1967_3_11_a0,
     title = {50 {\cyrl}{\cyre}{\cyrt} {\cyrn}{\cyro}{\cyrv}{\cyro}{\cyrishrt} {\cyrerev}{\cyrr}{\cyrery}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1819--1820},
     publisher = {mathdoc},
     volume = {3},
     number = {11},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_11_a0/}
}