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\bibitem{Croitoru_etal2012} {\textquotedblleft}\textit{The Cooper problem in nanoscale : enhancement of the coupling due to confinement}{\textquotedblright}. Croitoru MD, Vagov A, Shanenko AA, Axt VM, Superconductor science and technology \textbf{25}, 124001 (2012).   http://doi.org/10.1088/0953-2048/25/12/124001

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