@article{SLC_1996_37_a1,
     author = {Mohamed El Marraki and Nicolas Hanusse and J\"org Zipperer and Alexander Zvonkin},
     title = {Cacti, {Braids} and {Complex} {Polynomials}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1996},
     volume = {37},
     url = {http://geodesic.mathdoc.fr/item/SLC_1996_37_a1/}
}