@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/