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\bibitem{Pokatilov_etal2003} {\textquotedblleft}\textit{Bipolaron stability in an ellipsoidal potential well}{\textquotedblright}. Pokatilov EP, Croitoru MD, Fomin VM, Devreese JT, Physica status solidi: B: basic research \textbf{237}, 244 (2003).   http://doi.org/10.1002/pssb.200301785

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