@misc{DE_1969_5_3_a22,
     title = {Bibliography of journal articles},
     journal = {Differencialʹnye uravneni\^a},
     pages = {581--588},
     year = {1969},
     volume = {5},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_3_a22/}
}