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\bibitem{Covaci+Berciu2007} {\textquotedblleft}\textit{Holstein polaron: The effect of coupling to multiple-phonon modes}{\textquotedblright}. Covaci L, Berciu M, Epl \textbf{80}, 67001 (2007).   http://doi.org/10.1209/0295-5075/80/67001

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