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\bibitem{Schowalter_etal2004} {\textquotedblleft}\textit{First-principles calculations of the mean inner Coulomb potential for sphalerite type II.VI semiconductors}{\textquotedblright}. Schowalter M, Lamoen D, Kruse P, Gerthsen D, Rosenauer A, Applied Physics Letters \textbf{85}, 4938 (2004).   http://doi.org/10.1063/1.1823598

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