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\bibitem{Bogaerts_etal1998} {\textquotedblleft}\textit{Collisional-radiative model for an argon glow discharge}{\textquotedblright}. Bogaerts A, Gijbels R, Vlcek J, Journal of applied physics \textbf{84}, 121 (1998).   http://doi.org/10.1063/1.368009

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