TY  - JOUR
AU  - R. I. Bogdanov
TI  - Modules of $C^\infty$-orbital normal forms for singular points of vector fields on a plane
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1977
SP  - 57
EP  - 58
VL  - 11
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1977_11_1_a6/
LA  - ru
ID  - FAA_1977_11_1_a6
ER  -