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\bibitem{Yang_etal2008} {\textquotedblleft}\textit{TEM and Raman characterisation of diamond micro- and nanostructures in carbon spherules from upper soils}{\textquotedblright}. Yang ZQ, Verbeeck J, Schryvers D, Tarcea N, Popp J, R{\"o}sler W, Diamond and related materials \textbf{17}, 937 (2008).   http://doi.org/10.1016/j.diamond.2008.01.104

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