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\bibitem{Geim_etal2000} {\textquotedblleft}\textit{Non-quantized penetration of magnetic field in the vortex state of superconductors}{\textquotedblright}. Geim AK, Dubonos SV, Grigorieva IV, Novoselov KS, Peeters FM, Schweigert VA, Nature \textbf{407}, 55 (2000).   http://doi.org/10.1038/35024025

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