@article{PORMA_1994__51_3_47450,
     author = {Cordovil, Raul},
     title = {On the center of the fundamental group of the complement of a hyperplane arrangement.},
     journal = {Portugaliae mathematica},
     pages = {363--373},
     publisher = {mathdoc},
     volume = {51},
     number = {3},
     year = {1994},
     zbl = {0841.55006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1994__51_3_47450/}
}