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\bibitem{Baguer_etal2005} {\textquotedblleft}\textit{Study of the Ar metastable atom population in a hollow cathode discharge by means of a hybrid model and spectrometric measurements}{\textquotedblright}. Baguer N, Bogaerts A, Donko Z, Gijbels R, Sadeghi N, Journal of applied physics \textbf{97}, 123305 (2005).   http://doi.org/10.1063/1.1929857

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