TY  - JOUR
AU  - A. G. Surkov
TI  - Sharp upper and lower bounds for characteristic indices of a two-dimensional system with bounded perturbations
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 1534
EP  - 1541
VL  - 19
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_9_a8/
LA  - ru
ID  - DE_1983_19_9_a8
ER  -