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\bibitem{Shanenko_etal2008} {\textquotedblleft}\textit{Andreev-type states induced by quantum confinement}{\textquotedblright}. Shanenko AA, Croitoru MD, Mints RG, Peeters FM, Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques \textbf{2}, 611 (2008).   http://doi.org/10.1134/S1027451008040216

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