TY  - JOUR
AU  - V. V. Zhikov
TI  - The stability and instability of Levinson's center
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 2167
EP  - 2170
VL  - 8
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_12_a6/
LA  - ru
ID  - DE_1972_8_12_a6
ER  -