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\bibitem{Kelly_etal2021} {\textquotedblleft}\textit{Thermal instability and volume contraction in a pulsed microwave N$_{2}$plasma at sub-atmospheric pressure}{\textquotedblright}. Kelly S, van de Steeg A, Hughes A, van Rooij G, Bogaerts A, Plasma Sources Science \& Technology \textbf{30}, 055005 (2021).   http://doi.org/10.1088/1361-6595/abf1d6

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