TY - JOUR AU - R. I. Bogdanov TI - Multiplicative Theory of Orbital Equivalence of Vector Fields in the Plane JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1998 SP - 101 EP - 126 VL - 221 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM_1998_221_a5/ LA - ru ID - TM_1998_221_a5 ER -