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\bibitem{Fei_etal2012} {\textquotedblleft}\textit{Spatial variation behaviors of argon inductively coupled plasma during discharge mode transition}{\textquotedblright}. Fei G, Xue-Chun L, Zhao S-X, You-Nian W, Chinese physics B \textbf{21}, 075203 (2012).   http://doi.org/10.1088/1674-1056/21/7/075203

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