TY  - JOUR
AU  - N. S. Berezkina
TI  - Classes of third-order systems without moving critical points
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 517
EP  - 520
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_3_a18/
LA  - ru
ID  - DE_1985_21_3_a18
ER  -