Quantum kinetic equation and universal conductance fluctuations in   graphene
  We analyze universal conductance fluctuations (UCF) in graphene in the framework of diagrammatic perturbation theory in the metallic regime. It is shown that strong inter-valley scattering lifts the valley degeneracy of electronic states, whereas at weak inter-valley scattering two valleys contribute independently such that the variance of UCF would be expected to show sample- and geometry-dependent behavior. 
K. Kechedzhi, O. Kashuba, and Vladimir I. Fal'ko