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\bibitem{Li_etal2011} {\textquotedblleft}\textit{Impact of spin-orbit coupling on the Holstein polaron}{\textquotedblright}. Li Z, Covaci L, Berciu M, Baillie D, Marsiglio F, Physical review : B : condensed matter and materials physics \textbf{83}, 195104 (2011).   http://doi.org/10.1103/PhysRevB.83.195104

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