TY - JOUR AU - O. E. Orel TI - Topological analysis of a neighbourhood of a degenerate one-dimensional orbit of the Poisson action of $\mathbb R^2$ on the symplectic manifold $M^4$ JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1993 SP - 176 EP - 177 VL - 48 IS - 6 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1993_48_6_a14/ LA - en ID - RM_1993_48_6_a14 ER -