TY  - JOUR
AU  - Yu. S. Bogdanov
TI  - On the existence of an approximative sequence for a regular linear differential system
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1960
VL  - 15
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/RM_1960_15_1_a7/
LA  - ru
ID  - RM_1960_15_1_a7
ER  -