Ground State Entropy of the Potts Antiferromagnet on Homeomorphic   Expansions of Kagome Lattice Strips
  We present exact calculations of the chromatic polynomial and resultant ground state entropy of the $q$-state Potts antiferromagnet on lattice strips that are homeomorphic expansions of a strip of the kagome lattice. The dependence of the ground state entropy on the form of homeomorphic expansion is elucidated. 
Robert Shrock and Yan Xu
cond-mat.stat-mech math-ph math.MP