@article{MS2_1973__33_166313,
     author = {Charles H. Goldberg},
     title = {An {Exact} {Sequence} of {Braid} {Groups.}},
     journal = {Mathematica Scandinavica},
     pages = {69--82},
     year = {1973},
     volume = {33},
     zbl = {0285.57002},
     url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166313/}
}