Phase structure, critical points and susceptibilities in   Nambu-Jona-Lasinio type models
  We investigate the chiral phase transition at finite temperature and chemical potential within SU(2) and SU(3) Nambu-Jona-Lasinio type models. The behavior of the baryon number susceptibility and the specific heat, in the vicinity of the critical end point, is studied. The class of the critical points is analyzed by calculating critical exponents. 
C. A de Sousa, Pedro Costa and M. C. Ruivo