@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/