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\bibitem{vanStraaten_etal1995} {\textquotedblleft}\textit{Experimental determination of the energy distribution of ions bombarding the cathode surface in a glow discharge}{\textquotedblright}. van Straaten M, Bogaerts A, Gijbels R, Spectrochimica acta: part B : atomic spectroscopy \textbf{50}, 583 (1995).   http://doi.org/10.1016/0584-8547(94)00158-R

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