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\bibitem{Baguer_etal2003} {\textquotedblleft}\textit{Role of the fast Ar atoms, Ar$^{+}$ ions and metastable Ar atoms in a hollow cathode glow discharge: study by a hybrid model}{\textquotedblright}. Baguer N, Bogaerts A, Gijbels R, Journal of applied physics \textbf{94}, 2212 (2003).   http://doi.org/10.1063/1.1594276

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