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\bibitem{Neyts_etal2006} {\textquotedblleft}\textit{Effect of hydrogen on the growth of thin hydrogenated amorphous carbon films from thermal energy radicals}{\textquotedblright}. Neyts E, Bogaerts A, van de Sanden MCM, Applied physics letters \textbf{88}, 141922 (2006).   http://doi.org/10.1063/1.2193803

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