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\bibitem{Wen_etal2014} {\textquotedblleft}\textit{Phase modulation in pulsed dual-frequency capacitively coupled plasmas}{\textquotedblright}. Wen D-Q, Zhang Q-Z, Jiang W, Song U-H, Bogaerts A, Wang Y-N, Journal of applied physics \textbf{115}, 233303 (2014).   http://doi.org/10.1063/1.4884225

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