@article{article20ea6c18,
title   = {The lower central and derived series of the braid groups of the finitely-punctured sphere},
author = {Gonçalves, Daciberg Lima and Guaschi, John},
year = {2009},
doi = {10.1142/S0218216509007117},
journal   = {Journal of Knot Theory and its Ramifications}
}