@article{01522373, title = {Splittings of groups and intersection numbers.}, journal = {Geometry \& Topology}, volume = {4}, year = {2000}, pages = {179-218}, doi = {10.2140/gt.2000.4.179}, zbl = {0983.20024}, language = {en}, url = {http://dml.mathdoc.fr/item/01522373} }
Scott, Peter; Swarup, Gadde A. Splittings of groups and intersection numbers.. Geometry & Topology, Tome 4 (2000) pp. 179-218. doi : 10.2140/gt.2000.4.179. http://gdmltest.u-ga.fr/item/01522373/