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\bibitem{Farias_etal1996} {\textquotedblleft}\textit{Acoustical polarons and bipolarons in two dimensions}{\textquotedblright}. Farias GA, da Costa WB, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{54}, 12835 (1996).   http://doi.org/10.1103/PhysRevB.54.12835

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