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\bibitem{Matulis+Peeters1994} {\textquotedblleft}\textit{Renormalized perturbation series for quantum dots}{\textquotedblright}. Matulis A, Peeters FM, Journal of physics : condensed matter \textbf{6}, 7751 (1994).   http://doi.org/10.1088/0953-8984/6/38/013

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