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\bibitem{Zha_etal2015} {\textquotedblleft}\textit{Majorana zero-energy modes and spin current evolution in mesoscopic superconducting loop systems with spin-orbit interaction}{\textquotedblright}. Zha G-Q, Covaci L, Peeters FM, Zhou S-P, Physical review : B : condensed matter and materials physics \textbf{92}, 094516 (2015).   http://doi.org/10.1103/PhysRevB.92.094516

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