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\bibitem{Jakovljevic_etal2018} {\textquotedblleft}\textit{Helical edge states in silicene and germanene nanorings in perpendicular magnetic field}{\textquotedblright}. Jakovljevic DZ, Grujic MM, Tadic MZ, Peeters FM, Journal of physics : condensed matter \textbf{30}, 035301 (2018).   http://doi.org/10.1088/1361-648X/AA9E67

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