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\bibitem{Wang+Bogaerts2016} {\textquotedblleft}\textit{Effective ionisation coefficients and critical breakdown electric field of CO$_{2}$at elevated temperature: effect of excited states and ion kinetics}{\textquotedblright}. Wang W, Bogaerts A, Plasma sources science and technology \textbf{25}, 055025 (2016).   http://doi.org/10.1088/0963-0252/25/5/055025

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