TY  - JOUR
AU  - I. N. Sergeev
TI  - Invariance of central exponents with respect to perturbations which approach zero at infinity
JO  - Differencialʹnye uravneniâ
PY  - 1980
SP  - 1719
VL  - 16
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1980_16_9_a18/
LA  - ru
ID  - DE_1980_16_9_a18
ER  -