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\bibitem{Bogaerts+Gijbels1998} {\textquotedblleft}\textit{Argon and copper optical emission spectra in a Grimm glow discharge source: mathematical simulations and comparison with experiment}{\textquotedblright}. Bogaerts A, Gijbels R, Journal of analytical atomic spectrometry \textbf{13}, 721 (1998).   http://doi.org/10.1039/a802894j

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