@article{DE_1991_27_9_a3,
     author = {V. N. Bobochko},
     title = {Asymptotic integration of a system of differential equations with a turning point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1505--1515},
     year = {1991},
     volume = {27},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_9_a3/}
}