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\bibitem{Georgieva+Bogaerts2006} {\textquotedblleft}\textit{Negative ion behavior in single- and dual-frequency plasma etching reactors: particle-in-cell/Monte Carlo collision study}{\textquotedblright}. Georgieva V, Bogaerts A, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{73}, 036402 (2006).   http://doi.org/10.1103/PhysRevE.73.036402

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