@article{DE_1967_3_4_a3,
     author = {I. N. Zboychik},
     title = {Representations of a solution of a system of linear differential equations in a neighborhood of an irregular singular point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {601--618},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_4_a3/}
}