@article{DE_1971_7_2_a8,
     author = {V. I. Rozhkov and A. M. Popov},
     title = {Estimates of the solutions of certain systems of differential equations with time lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {271--278},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_2_a8/}
}