@article{DE_1989_25_9_a5,
     author = {T. B. Kopeikina},
     title = {Controllability of linear singularly perturbed systems with delay},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1508--1518},
     year = {1989},
     volume = {25},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1989_25_9_a5/}
}