Critical properties of 2D Z(N) vector models for N>4
  We investigate the critical properties of two-dimensional Z(N) vector models for N larger than 4. In particular, critical points of the two phase transitions are located and some critical indices are determined. We study also the behavior of the helicity modulus and the dependence of the critical points on N. 
Oleg Borisenko, Gennaro Cortese, Roberto Fiore, Mario Gravina,   Alessandro Papa
hep-lat cond-mat.stat-mech