@article{DE_1968_4_3_a21,
     author = {L. I. Kamynin},
     title = {{\CYRP}{\cyro}{\cyrp}{\cyrr}{\cyra}{\cyrv}{\cyrk}{\cyra}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {564},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_3_a21/}
}