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\bibitem{Peeters_etal1991} {\textquotedblleft}\textit{Possible (bi) polaron effects in the high-t$_{c}$ superconductors}{\textquotedblright}. Peeters FM, Devreese JT, Verbist G, Physica scripta
T2 -- 11TH General Conf. Of the Condensed Matter Division of the European Physical Society, April 08-11, 1991, Exeter, England \textbf{T39}, 66 (1991).   http://doi.org/10.1088/0031-8949/1991/T39/007

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