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\bibitem{Baelus_etal2001} {\textquotedblleft}\textit{Saddle point states and energy barriers for vortex entrance and exit in superconducting disks and rings}{\textquotedblright}. Baelus BJ, Peeters FM, Schweigert VA, Physical review : B : condensed matter and materials physics \textbf{63}, 144517 (2001).   http://doi.org/10.1103/PhysRevB.63.144517

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