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\bibitem{Vansant_etal1994} {\textquotedblleft}\textit{One-dimensional bipolaron in the strong coupling limit}{\textquotedblright}. Vansant P, Smondyrev MA, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics \textbf{50}, 12524 (1994).   http://doi.org/10.1103/PhysRevB.50.12524

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