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\bibitem{Ghosh_etal2013} {\textquotedblleft}\textit{Self-propelled Janus particles in a ratchet : numerical simulations}{\textquotedblright}. Ghosh PK, Misko VR, Marchesoni F, Nori F, Physical review letters \textbf{110}, 1 (2013).   http://doi.org/10.1103/PhysRevLett.110.268301

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