TY  - JOUR
AU  - R. I. Bogdanov
TI  - Versal deformations of a singular point of a vector field on the plane in the case of zero eigenvalues
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1975
SP  - 63
VL  - 9
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1975_9_2_a9/
LA  - ru
ID  - FAA_1975_9_2_a9
ER  -