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\bibitem{Shanenko_etal2008} {\textquotedblleft}\textit{Superconducting nanofilms: Andreev-type states induced by quantum confinement}{\textquotedblright}. Shanenko AA, Croitoru MD, Peeters FM, Physical review : B : solid state \textbf{78}, 054505 (2008).   http://doi.org/10.1103/PhysRevB.78.054505

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