TY  - JOUR
AU  - I. A. Volkov
TI  - Boundaries of a set of characteristic exponents of linear differential systems with higher-order perturbations
JO  - Differencialʹnye uravneniâ
PY  - 1991
SP  - 2050
EP  - 2053
VL  - 27
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1991_27_12_a3/
LA  - ru
ID  - DE_1991_27_12_a3
ER  -