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\bibitem{Roditchev_etal2015} {\textquotedblleft}\textit{Direct observation of Josephson vortex cores}{\textquotedblright}. Roditchev D, Brun C, Serrier-Garcia L, Cuevas JC, Bessa VHL, Milo{\v s}evi{\'c} MV, Debontridder F, Stolyarov V, Cren T, Nature physics \textbf{11}, 332 (2015).   http://doi.org/10.1038/nphys3240

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