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\bibitem{Georgieva_etal2004} {\textquotedblleft}\textit{Numerical investigation of ion energy distribution functions in single and dual frequency capacitively coupled plasma reactors}{\textquotedblright}. Georgieva V, Bogaerts A, Gijbels R, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{69}, 026406 (2004).   http://doi.org/10.1103/PhysRevE.69.026406

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