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\bibitem{Shi_etal1996} {\textquotedblleft}\textit{Effects of the DX centers on electronic structure of a δ-doped quantum barrier}{\textquotedblright}. Shi JM, Koenraad PM, van de Stadt AFW, Peeters FM, Devreese JT, Wolter JH, , 2355 (1996)

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