TY  - JOUR
AU  - È. A. Tikhonova
TI  - An analogy between the solutions of perturbed and unperturbed systems and the completeness of a divided diagonal matrix
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1037
EP  - 1054
VL  - 5
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_6_a6/
LA  - ru
ID  - DE_1969_5_6_a6
ER  -