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Koller, S. and Leijnse, M. and Wegewijs, M. R. and Grifoni, M. (2010) Density-operator approaches to transport through interacting quantum dots: Simplifications in fourth-order perturbation theory. Phys. Rev. B 82 (23), p. 235307.
Hornberger, R. P. and Koller, S. and Begemann, G. and Donarini, Andrea and Grifoni, Milena (2008) Transport through a double-quantum-dot system with noncollinearly polarized leads. Phys. Rev. B 77 (24; 18), p. 245313.