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\bibitem{Croitoru_etal2012} {\textquotedblleft}\textit{Ultra-small metallic grains : effect of statistical fluctuations of the chemical potential on superconducting correlations and vice versa}{\textquotedblright}. Croitoru MD, Shanenko AA, Kaun CC, Peeters FM, Journal of physics : condensed matter \textbf{24}, 275701 (2012).   http://doi.org/10.1088/0953-8984/24/27/275701

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