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\bibitem{Thome_etal2007} {\textquotedblleft}\textit{Formation of carbon nitride nanospheres by ion implantation}{\textquotedblright}. Thom{\'e} T, Colaux JL, Colomer J-F, Bertoni G, Terwagne G, Materials chemistry and physics \textbf{103}, 290 (2007).   http://doi.org/10.1016/j.matchemphys.2007.02.028

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