TY  - JOUR
AU  - V. V. Martynov
TI  - Direct methods for the qualitative spectral analysis of a nonselfadjoint system of first order differential equations. I
JO  - Differencialʹnye uravneniâ
PY  - 1968
SP  - 1494
EP  - 1508
VL  - 4
IS  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1968_4_8_a13/
LA  - ru
ID  - DE_1968_4_8_a13
ER  -