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\bibitem{Badalyan_etal2013} {\textquotedblleft}\textit{Spin-orbit-interaction induced singularity of the charge density relaxation propagator}{\textquotedblright}. Badalyan SM, Matos-Abiague A, Fabian J, Vignale G, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{88}, 195402 (2013).   http://doi.org/10.1103/PhysRevB.88.195402

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