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\bibitem{Bogaerts_etal1998} {\textquotedblleft}\textit{Collisional-radiative model for the sputtered copper atoms and ions in a direct current argon glow discharge}{\textquotedblright}. Bogaerts A, Gijbels R, Carman RJ, Spectrochimica acta: part B : atomic spectroscopy \textbf{53}, 1679 (1998).   http://doi.org/10.1016/S0584-8547(98)00201-8

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