TY  - JOUR
AU  - A. F. Andreev
AU  - P. D. Khody-Zade
TI  - Investigation of the problem of the center and focus in one case
JO  - Differencialʹnye uravneniâ
PY  - 1984
SP  - 187
EP  - 197
VL  - 20
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1984_20_2_a0/
LA  - ru
ID  - DE_1984_20_2_a0
ER  -