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\bibitem{Shanenko+Croitoru2006} {\textquotedblleft}\textit{Shape resonances in the superconducting order parameter of ultrathin nanowires}{\textquotedblright}. Shanenko AA, Croitoru MD, Physical review : B : condensed matter and materials physics \textbf{73}, 012510 (2006).   http://doi.org/10.1103/PhysRevB.73.012510

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