Main Referencies About the IPT method:
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New Iterative Perturbation Scheme for Lattice Models with Arbitrary
Filling
H. Kajueter and G. Kotliar
Phys. Rev. Lett. 77, 131-134 (1996) [View
PDF (125 kB)]
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Interpolating Perturbation Scheme for Correlated Electron Systems
H. Kajueter
Thesis, Rutgers University [View
PDF (1100 kB)]