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\bibitem{Covaci+Berciu2009} {\textquotedblleft}\textit{Polaron formation in the presence of Rashba spin-orbit coupling: implications for spintronics}{\textquotedblright}. Covaci L, Berciu M, Physical Review Letters \textbf{102}, 186403 (2009).   http://doi.org/10.1103/PhysRevLett.102.186403

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