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\bibitem{Titantah+Lamoen2006} {\textquotedblleft}\textit{First-principles characterization of amorphous carbon nitride systems: structural and electronic properties}{\textquotedblright}. Titantah JT, Lamoen D, Physica status solidi: A: applied research \textbf{203}, 3191 (2006).   http://doi.org/10.1002/pssa.200671107

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