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\bibitem{Saeed_etal2014} {\textquotedblleft}\textit{Investigation of 50 Hz pulsed DC nitrogen plasma with active screen cage by trace rare gas optical emission spectroscopy}{\textquotedblright}. Saeed A, Khan AW, Shafiq M, Jan F, Abrar M, Zaka-ul-Islam M, Zakaullah M, Plasma science \& technology \textbf{16}, 324 (2014).   http://doi.org/10.1088/1009-0630/16/4/05

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