@article{IM_1994__117_1_144225,
     author = {Donald J. Collins},
     title = {Relations among the squares of the generators of the braid groups.},
     journal = {Inventiones mathematicae},
     pages = {525--530},
     publisher = {mathdoc},
     volume = {117},
     number = {1},
     year = {1994},
     zbl = {0822.20040},
     url = {http://geodesic.mathdoc.fr/item/IM_1994__117_1_144225/}
}