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\bibitem{Kolev+Bogaerts2008} {\textquotedblleft}\textit{Calculation of gas heating in a dc sputter magnetron}{\textquotedblright}. Kolev I, Bogaerts A, Journal of applied physics \textbf{104}, 093301 (2008).   http://doi.org/10.1063/1.2970166

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