@article{DE_1969_5_6_a4,
     author = {Yu. V. Kuznetsov},
     title = {On the analytic theory of infinite systems of linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1018--1028},
     publisher = {mathdoc},
     volume = {5},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_6_a4/}
}