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\bibitem{Baelus_etal2007} {\textquotedblleft}\textit{Vortex structures in mesoscopic superconducting spheres}{\textquotedblright}. Baelus BJ, Sun D, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{75}, 174523 (2007).   http://doi.org/10.1103/PhysRevB.75.174523

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