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\bibitem{Shi_etal1995} {\textquotedblleft}\textit{D$^{-}$ states in GaAs/Al$_{x}$Ga$_{1-x}$As superlattices in a magnetic field}{\textquotedblright}. Shi JM, Peeters FM, Devreese JT, Physical review : B : condensed matter and materials physics \textbf{51}, 7714 (1995).   http://doi.org/10.1103/PhysRevB.51.7714

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