@article{GDZPPN002339919,
title = {Isotopy of sympletic balls, Gromov' s radius and the structure of ruled symplectic 4-manifolds.},
journal = {Mathematische Annalen},
volume = {300},
year = {1994},
pages = {273-296},
zbl = {0812.53032},
url = {http://dml.mathdoc.fr/item/GDZPPN002339919}
}
Lalonde, Francois. Isotopy of sympletic balls, Gromov' s radius and the structure of ruled symplectic 4-manifolds.. Mathematische Annalen, Tome 300 (1994) pp. 273-296. http://gdmltest.u-ga.fr/item/GDZPPN002339919/