TY - JOUR AU - È. A. Tikhonova TI - Similarity of the solutions of a perturbed and an unperturbed system with a divided-diagonal matrix JO - Differencialʹnye uravneniâ PY - 1970 SP - 962 EP - 974 VL - 6 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1970_6_6_a2/ LA - ru ID - DE_1970_6_6_a2 ER -