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\bibitem{Zhang_etal2014} {\textquotedblleft}\textit{Heating mode transition in a hybrid direct current/dual-frequency capacitively coupled CF$_{4}$ discharge}{\textquotedblright}. Zhang Q-Z, Wang Y-N, Bogaerts A, Journal of applied physics \textbf{115}, 223302 (2014).   http://doi.org/10.1063/1.4882297

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