TY  - JOUR
AU  - N. B. Medvedeva
TI  - On the Analytic Solvability of the Problem of Distinguishing between Center and Focus
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 2006
SP  - 11
EP  - 100
VL  - 254
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TM_2006_254_a1/
LA  - ru
ID  - TM_2006_254_a1
ER  -