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\bibitem{daCosta+Peeters1996} {\textquotedblleft}\textit{The polaron-bipolaron transition for acoustical three-dimensional polarons}{\textquotedblright}. da Costa WB, Peeters FM, Journal of physics : condensed matter \textbf{8}, 2173 (1996).   http://doi.org/10.1088/0953-8984/8/13/009

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