@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/