TY  - JOUR
AU  - O. A. Ivanov
TI  - Necessity of Gomory's conditions for the existence of periodic solutions of two-dimensional quasihomogeneous systems
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 191
EP  - 198
VL  - 21
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_2_a1/
LA  - ru
ID  - DE_1985_21_2_a1
ER  -