Exact Mapping of Periodic Anderson Model to Kondo Lattice Model
  It is shown that the Kondo lattice model, for any finite coupling constant J, can be obtained exactly from the periodic Anderson model in an appropriate limit. The mapping allows a direct proof of the 'large' Fermi volume for a nonmagnetic Fermi-liquid state of the Kondo lattice model. 
P. Sinjukow, W. Nolting