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\bibitem{Geurts_etal2008} {\textquotedblleft}\textit{Topologically trapped vortex molecules in Bose-Einstein condensates}{\textquotedblright}. Geurts R, Milo{\v s}evi{\'c} MV, Peeters FM, Physical review : A : atomic, molecular and optical physics \textbf{78}, 053610 (2008).   http://doi.org/10.1103/PhysRevA.78.053610

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