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\bibitem{Zha_etal2014} {\textquotedblleft}\textit{Vortex-antivortex dynamics in mesoscopic symmetric and asymmetric superconducting loops with an applied ac current}{\textquotedblright}. Zha G-Q, Peeters FM, Zhou S-P, Europhysics letters \textbf{108}, 57001 (2014).   http://doi.org/10.1209/0295-5075/108/57001

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