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\bibitem{Yusupov_etal2011} {\textquotedblleft}\textit{Elucidating the asymmetric behavior of the discharge in a dual magnetron sputter deposition system}{\textquotedblright}. Yusupov M, Bultinck E, Depla D, Bogaerts A, Applied physics letters \textbf{98}, 131502 (2011).   http://doi.org/10.1063/1.3574365

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