@article{DE_1972_8_11_a6,
     author = {N. I. Krupnova and S. N. Shimanov},
     title = {The instability of the solutions of linear systems of differential equations with lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1963--1968},
     publisher = {mathdoc},
     volume = {8},
     number = {11},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_11_a6/}
}