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\bibitem{Croitoru_etal2015} {\textquotedblleft}\textit{Phonon limited superconducting correlations in metallic nanograins}{\textquotedblright}. Croitoru MD, Shanenko AA, Vagov A, Milo{\v s}evi{\'c} MV, Axt VM, Peeters FM, Scientific reports \textbf{5}, 16515 (2015).   http://doi.org/10.1038/srep16515

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