Analytical and numerical treatment of the Mott–Hubbard insulator in infinite dimensionsM. P. Eastwood, F. Gebhard, E. Kalinowski, S. Nishimoto and R. M. NoackEur. Phys. J. B, 35 2 (2003) 155-175DOI: https://doi.org/10.1140/epjb/e2003-00266-4