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\bibitem{Lin_etal2011} {\textquotedblleft}\textit{Rectification of vortex motion in a circular ratchet channel}{\textquotedblright}. Lin NS, Heitmann TW, Yu K, Plourde BLT, Misko VR, Physical review : B : condensed matter and materials physics \textbf{84}, 144511 (2011).   http://doi.org/10.1103/PhysRevB.84.144511

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