@article{DE_1973_9_11_a25,
     author = {V. Z. Tsalyuk},
     title = {A certain estimate for the solutions of systems of linear differential equations with lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2099--2101},
     publisher = {mathdoc},
     volume = {9},
     number = {11},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_11_a25/}
}