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\bibitem{Shi_etal1998} {\textquotedblleft}\textit{Polaron effect on D$^{-}$ centers in weakly polar semiconductors}{\textquotedblright}. Shi JM, Peeters FM, Farias GA, Freire JAK, Hai GQ, Devreese JT, Bednarek S, Adamowski J, Physical review : B : condensed matter and materials physics \textbf{57}, 3900 (1998).   http://doi.org/10.1103/PhysRevB.57.3900

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