TY - JOUR AU - Francois Lalonde TI - Isotopy of sympletic balls, Gromov' s radius and the structure of ruled symplectic 4-manifolds. JO - Mathematische Annalen PY - 1994 SP - 273 EP - 296 VL - 300 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAN_1994__300_2_165253/ ID - MAN_1994__300_2_165253 ER -