Fermionic renormalization group flow into phases with broken discrete symmetry: charge-density wave mean-field modelR. Gersch, C. Honerkamp, D. Rohe and W. MetznerEur. Phys. J. B, 48 3 (2005) 349-358DOI: https://doi.org/10.1140/epjb/e2005-00416-8