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\bibitem{Titantah+Lamoen2007} {\textquotedblleft}\textit{Carbon and nitrogen 1s energy levels in amorphous carbon nitride systems: XPS interpretation using first-principles}{\textquotedblright}. Titantah JT, Lamoen D, Diamond And Related Materials \textbf{16}, 581 (2007).   http://doi.org/10.1016/j.diamond.2006.11.048

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