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\bibitem{Zhao_etal2008} {\textquotedblleft}\textit{Vortex states in mesoscopic superconducting squares: formation of vortex shells}{\textquotedblright}. Zhao HJ, Misko VR, Peeters FM, Oboznov V, Dubonos SV, Grigorieva IV, Physical review : B : condensed matter and materials physics \textbf{78}, 104517 (2008).   http://doi.org/10.1103/PhysRevB.78.104517

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