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\bibitem{Kolev+Bogaerts2009} {\textquotedblleft}\textit{Numerical study of the sputtering in a dc magnetron}{\textquotedblright}. Kolev I, Bogaerts A, Journal of vacuum science and technology: A: vacuum surfaces and films \textbf{27}, 20 (2009).   http://doi.org/10.1021/jp8058992

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