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\bibitem{Smondyrev_etal1994} {\textquotedblleft}\textit{Exact equations for large bipolarons in the strong-coupling limit}{\textquotedblright}. Smondyrev MA, Peeters FM, Vansant P, Devreese JT, Journal of physics: A: mathematical and general \textbf{27}, 7925 (1994)

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