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\bibitem{Doria_etal2007} {\textquotedblleft}\textit{Threefold onset of vortex loops in superconductors with a magnetic core}{\textquotedblright}. Doria MM, Romaguera AR de C, Milo{\v s}evi{\'c} MV, Peeters FM, Europhysics letters \textbf{79}, 47006 (2007).   http://doi.org/10.1209/0295-5075/79/47006

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