@article{DE_1970_6_8_a3,
     author = {B. G. Razumeiko},
     title = {The fundamental system of solutions of an ordinary linear differential equation with a small parameter},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1366--1377},
     publisher = {mathdoc},
     volume = {6},
     number = {8},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_8_a3/}
}