Double occupancy in DMFT and the Dual Boson approach

@inproceedings{Loon2016DoubleOI,
  title={Double occupancy in DMFT and the Dual Boson approach},
  author={Erik G. C. P. van Loon and Friedrich Krien and Hartmut Hafermann and Evgeny and A. Stepanov and Alexander Lichtenstein and Mikhail I. Katsnelson},
  year={2016}
}
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