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\bibitem{Shanenko_etal2006} {\textquotedblleft}\textit{Quantum-size effects on T-c in superconducting nanofilms}{\textquotedblright}. Shanenko AA, Croitoru MD, Peeters FM, Europhysics letters \textbf{76}, 498 (2006).   http://doi.org/10.1209/epl/i2006-10274-6

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