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\bibitem{Bogaerts+Gijbels1999} {\textquotedblleft}\textit{Role of Ar$^{2+}$ and Ar$^{+}$$_{2}$ ions in a direct current argon glow discharge: a numerical description}{\textquotedblright}. Bogaerts A, Gijbels R, Journal of applied physics \textbf{86}, 4124 (1999).   http://doi.org/10.1063/1.371337

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