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\bibitem{Jiang_etal2021} {\textquotedblleft}\textit{Reversible ratchet effects in a narrow superconducting ring}{\textquotedblright}. Jiang J, Wang Y-L, Milo{\v s}evi{\'c} MV, Xiao Z-L, Peeters FM, Chen Q-H, Physical Review B \textbf{103}, 014502 (2021).   http://doi.org/10.1103/PHYSREVB.103.014502

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