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\bibitem{Smondyrev_etal1995} {\textquotedblleft}\textit{Asymptotic expansions in the path integral approach to the bipolaron problem}{\textquotedblright}. Smondyrev MA, Devreese JT, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{51}, 15008 (1995).   http://doi.org/10.1103/PhysRevB.51.15008

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