Multiplet Effects in the Quasiparticle Band Structure of the $f^1-f^2$   Anderson Model
  In this paper, we examine the mean field electronic structure of the $f^1-f^2$ Anderson lattice model in a slave boson approximation, which should be useful in understanding the physics of correlated metals with more than one f electron per site such as uranium-based heavy fermion superconductors. We find that the multiplet structure of the $f^2$ ion acts to quench the crystal field splitting in the quasiparticle electronic structure. This is consistent with experimental observations in such metals as $UPt_3$. 
B.R. Trees, A.J. Fedro, M.R. Norman