Comment on "Electron screening and excitonic condensation in   double-layer graphene systems"
  The influence of screening on the condensed state of bilayer graphene is studied within the framework of the Thomas Fermi approximation. We find that screening has little effect on the Kosterlitz-Thouless temperature in the strongly interacting regime. Furthermore, we predict that the phase transition to the condensed state is first order. 
R. Bistritzer, H. Min, J. J. Su, and A.H. MacDonald