TY  - JOUR
AU  - L. V. Detchenya
AU  - A. P. Sadovskii
TI  - Orbital normal forms of two-dimensional analytic systems with zero linear and nonzero quadratic parts
JO  - Differencialʹnye uravneniâ
PY  - 1999
SP  - 51
EP  - 57
VL  - 35
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1999_35_1_a7/
LA  - ru
ID  - DE_1999_35_1_a7
ER  -