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\bibitem{Lin_etal2012} {\textquotedblleft}\textit{Density dependence of the rectification of vortex motion in a circular asymmetric channel}{\textquotedblright}. Lin NS, Misko VR, Heitmann TW, Yu K, Plourde BLT, Physica: C : superconductivity \textbf{479}, 137 (2012).   http://doi.org/10.1016/j.physc.2011.12.028

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