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\bibitem{Simon+Bogaerts2011} {\textquotedblleft}\textit{Vibrational level population of nitrogen impurities in low-pressure argon glow discharges}{\textquotedblright}. Simon P, Bogaerts A, Journal of analytical atomic spectrometry \textbf{26}, 804 (2011).   http://doi.org/10.1039/c0ja00179a

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