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\bibitem{Schowalter_etal2005} {\textquotedblleft}\textit{Ab initio computation of the mean inner Coulomb potential of amorphous carbon structures}{\textquotedblright}. Schowalter M, Titantah JT, Lamoen D, Kruse P, Applied physics letters \textbf{86}, 112102 (2005).   http://doi.org/10.1063/1.1885171

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