TY - JOUR AU - V. I. Rozhkov AU - A. M. Popov TI - Estimates of the solutions of certain systems of differential equations with time lag JO - Differencialʹnye uravneniâ PY - 1971 SP - 271 EP - 278 VL - 7 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1971_7_2_a8/ LA - ru ID - DE_1971_7_2_a8 ER -