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\bibitem{Zhang_etal2013} {\textquotedblleft}\textit{Vortex states in nanoscale superconducting squares : the influence of quantum confinement}{\textquotedblright}. Zhang L-F, Covaci L, Milo{\v s}evi{\'c} MV, Berdiyorov GR, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{88}, 144501 (2013).   http://doi.org/10.1103/PhysRevB.88.144501

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