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\bibitem{Grigorieva_etal2007} {\textquotedblleft}\textit{Pinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks}{\textquotedblright}. Grigorieva IV, Escoffier W, Misko VR, Baelus BJ, Peeters F, Vinnikov LY, Dubonos SV, Physical review letters \textbf{99}, 147003 (2007).   http://doi.org/10.1103/PhysRevLett.99.147003

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