@article{00710126,
title = {On the center of the fundamental group of the complement of a hyperplane arrangement.},
journal = {Portugaliae Mathematica. Nova S\'erie},
volume = {51},
year = {1994},
pages = {363-373},
zbl = {0841.55006},
language = {en},
url = {http://dml.mathdoc.fr/item/00710126}
}
Cordovil, Raul. On the center of the fundamental group of the complement of a hyperplane arrangement.. Portugaliae Mathematica. Nova Série, Tome 51 (1994) pp. 363-373. http://gdmltest.u-ga.fr/item/00710126/