Alan D. Sokal The multivariate Tutte polynomial (alias Potts model) for graphs and matroids. [Citation Graph (0, 0)][DBLP] Surveys in Combinatorics, 2005, pp:173-226 [Conf]
Alan D. Sokal Bounds On The Complex Zeros Of (Di)Chromatic Polynomials And Potts-Model Partition Functions. [Citation Graph (0, 0)][DBLP] Combinatorics, Probability & Computing, 2001, v:10, n:1, pp:- [Journal]
Alan D. Sokal Chromatic Roots are Dense in the Whole Complex Plane. [Citation Graph (0, 0)][DBLP] Combinatorics, Probability & Computing, 2004, v:13, n:2, pp:221-261 [Journal]