@article{DE_1984_20_5_a4,
     author = {I. B. Sorogovets},
     title = {Solutions of systems of linear differential equations with an irregular singular point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {786--792},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_5_a4/}
}