@article{SLC_2009-2011_61A_a4,
     author = {Alexander D. Scott and Alan D. Sokal},
     title = {Some {Variants} of the {Exponential} {Formula,} with {Application} to the {Multivariate} {Tutte} {Polynomial} (alias {Potts} {Model)}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {2009-2011},
     volume = {61A},
     url = {http://geodesic.mathdoc.fr/item/SLC_2009-2011_61A_a4/}
}