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\bibitem{Bultinck+Bogaerts2008} {\textquotedblleft}\textit{The effect of the magnetic field strength on the sheath region of a dc magnetron discharge}{\textquotedblright}. Bultinck E, Bogaerts A, Journal of physics: D: applied physics \textbf{41}, 202007 (2008).   http://doi.org/10.1088/0022-3727/41/20/202007

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