Magnetic oscillations in planar systems with the Dirac-like spectrum of   quasiparticle excitations II: transport properties
  The quantum magnetic oscillations of electrical (Shubnikov de Haas effect) and thermal conductivities are studied for graphene which represents a distinctive example of planar systems with a linear, Dirac-like spectrum of quasiparticle excitations. We show that if a utmost care was taken to separate electron and phonon contributions in the thermal conductivity, the oscillations of electron thermal conductivity, $\kappa(B)$ and the Lorenz number, $L(B)$ would be observable in the low field (less than a few Teslas) regime. 
V.P. Gusynin, S.G. Sharapov