@article{DE_1973_9_8_a3,
     author = {L. A. Groza},
     title = {Asymptotic solutions of second order linear homogeneous differential equations in a {Banach} space with a small parameter multiplying the highest derivative},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1393--1402},
     publisher = {mathdoc},
     volume = {9},
     number = {8},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_8_a3/}
}