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\bibitem{Misko_etal2007} {\textquotedblleft}\textit{Negative differential resistivity in superconductors with periodic arrays of pinning sites}{\textquotedblright}. Misko VR, Savel{\textquoteright}ev S, Rakhmanov AL, Nori F, Physical review : B : condensed matter and materials physics \textbf{75}, 024509 (2007).   http://doi.org/10.1103/PhysRevB.75.024509

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