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\bibitem{Smondyrev_etal1993} {\textquotedblleft}\textit{Stability of multipolaron matter}{\textquotedblright}. Smondyrev MA, Verbist G, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics \textbf{47}, 2596 (1993).   http://doi.org/10.1103/PhysRevB.47.2596

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