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The Green's functions relevant to the periodic Anderson Hamiltonian are calculated via perturbation theory around the atomic limit. The approximation reproduces exact results in three different limits: zero bandwidth, zero hybridization, and zero Coulomb correlation. The density of states, the magnetic susceptibility, and the electronic specific heat are calculated and discussed in both the Kondo and intermediate-valence regimes for different values of hybridization and Coulomb repulsion. The results are in qualitative agreement with experiments and are related to other theoretical calculations

Magnetic susceptibility and specific heat of the Anderson lattice: Perturbative expansion around the atomic limit