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\bibitem{Xu_etal2008} {\textquotedblleft}\textit{Magnetic properties of vortex states in spherical superconductors}{\textquotedblright}. Xu B, Milo{\v s}evi{\'c} MV, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{77}, 144509 (2008).   http://doi.org/10.1103/PhysRevB.77.144509

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