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\bibitem{Gamez_etal2004} {\textquotedblleft}\textit{Fundamental studies on a planar-cathode direct current glow discharge: part 1: characterization via laser scattering techniques}{\textquotedblright}. Gamez G, Bogaerts A, Andrade F, Hieftje GM, Spectrochimica acta: part B : atomic spectroscopy \textbf{59}, 435 (2004).   http://doi.org/10.1016/j.sab.2003.12.002

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