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\bibitem{Bogaerts_etal2003} {\textquotedblleft}\textit{Investigation of laser output power saturation in the He-Cu$^{+}$ IR hollow cathode discharge laser by experiments and numerical modeling}{\textquotedblright}. Bogaerts A, Gijbels R, Grozeva M, Sabotinov N, Physica scripta \textbf{T105}, 90 (2003).   http://doi.org/10.1238/Physica.Topical.105a00090

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