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\bibitem{Geurts_etal2009} {\textquotedblleft}\textit{Second generation of vortex-antivortex states in mesoscopic superconductors: stabilization by artificial pinning}{\textquotedblright}. Geurts R, Milo{\v s}evi{\'c} MV, Peeters FM, Physical review : B : solid state \textbf{79}, 174508 (2009).   http://doi.org/10.1103/PhysRevB.79.174508

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