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\bibitem{Croitoru_etal2011} {\textquotedblleft}\textit{Metallic nanograins : spatially nonuniform pairing induced by quantum confinement}{\textquotedblright}. Croitoru MD, Shanenko AA, Kaun CC, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{83}, 214509 (2011).   http://doi.org/10.1103/PhysRevB.83.214509

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