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\bibitem{Shi_etal1998} {\textquotedblleft}\textit{DX-center and pressure effects on electronic structure of a δ-doped quantum barrier}{\textquotedblright}. Shi JM, Koenraad PM, van de Stadt AFW, Peeters FM, Devreese JT, Wolter JH, Superlattices and microstructures \textbf{23}, 83 (1998).   http://doi.org/10.1006/spmi.1996.0327

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