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\bibitem{Bogaerts+Chen2004} {\textquotedblleft}\textit{Nanosecond laser ablation of Cu: modeling of the expansion in He background gas, and comparison with expansion in vacuum}{\textquotedblright}. Bogaerts A, Chen Z, Journal of analytical atomic spectrometry \textbf{19}, 1169 (2004).   http://doi.org/10.1039/b402946a

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