@article{02105203,
title = {Constructing symplectic forms on 4--manifolds which vanish on circles.},
journal = {Geometry \& Topology},
volume = {8},
year = {2004},
pages = {743-777},
doi = {10.2140/gt.2004.8.743},
zbl = {1054.57027},
language = {en},
url = {http://dml.mathdoc.fr/item/02105203}
}
Gay, David T.; Kirby, Robion. Constructing symplectic forms on 4--manifolds which vanish on circles.. Geometry & Topology, Tome 8 (2004) pp. 743-777. doi : 10.2140/gt.2004.8.743. http://gdmltest.u-ga.fr/item/02105203/