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\bibitem{Geurts_etal2006} {\textquotedblleft}\textit{Symmetric and asymmetric vortex-antivortex molecules in a fourfold superconducting geometry}{\textquotedblright}. Geurts R, Milo{\v s}evi{\'c} MV, Peeters FM, Physical review letters \textbf{97}, 1 (2006).   http://doi.org/10.1103/PhysRevLett.97.137002

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