Quark-Induced Correlations between Instantons Drive the Chiral Phase   Transition
  A simple model for the instanton ensemble at finite temperature T is proposed, including ``random" and strongly correlated ``molecular" component.   T-dependence of fermionic zero modes naturally leads to chiral symmetry restoration, without instanton suppression. Moreover, at $T=(1-2) T_c$ the non-perturbative effects due to ``molecules" are so strong, that they even dominate the global thermodynamics. % two figures are enclosed as .ps files 
E.-M.Ilgenfritz and E. V. Shuryak