An Exactly Solvable Model of Fermions with Disorder
  Non-perturbative results are obtained for multipoint correlation functions of the model of (2 + 1)-dimensional relativistic fermions in a random static non-Abelian gauge potential. The results indicate that the replica symmetry remains unbroken. We calculate the diffuson propagator and show that DC-conductivity for this model is finite. || 
A. M. Tsvelik