@article{01550944, title = {Higher order intersection numbers of 2-spheres in 4-manifolds.}, journal = {Geometry \& Topology}, volume = {5}, year = {2001}, pages = {1-29}, doi = {10.2140/agt.2001.1.1}, zbl = {0964.57022}, language = {en}, url = {http://dml.mathdoc.fr/item/01550944} }
Schneiderman, Rob; Teichner, Peter. Higher order intersection numbers of 2-spheres in 4-manifolds.. Geometry & Topology, Tome 5 (2001) pp. 1-29. doi : 10.2140/agt.2001.1.1. http://gdmltest.u-ga.fr/item/01550944/