A Family of Counter Examples to an Approach to Graph Isomorphism
  We give a family of counter examples showing that the two sequences of polytopes $\Phi_{n,n}$ and $\Psi_{n,n}$ are different. These polytopes were defined recently by S. Friedland in an attempt at a polynomial time algorithm for graph isomorphism. 
Jin-Yi Cai, Pinyan Lu and Mingji Xia