@article{SLC_2017_78B_a9,
     author = {Hugh Thomas and Nathan Williams},
     title = {Sweeping up {Zeta}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {2017},
     volume = {78B},
     url = {http://geodesic.mathdoc.fr/item/SLC_2017_78B_a9/}
}