@misc{DE_1966_2_5_a15,
     title = {{\CYRK}~50-{\cyrl}{\cyre}{\cyrt}{\cyri}{\cyryu} {{\CYRA}.\,{\CYRV}.~{\CYRB}{\cyri}{\cyrc}{\cyra}{\cyrd}{\cyrz}{\cyre}}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {716--719},
     publisher = {mathdoc},
     volume = {2},
     number = {5},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_5_a15/}
}