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\bibitem{Kong_etal2004} {\textquotedblleft}\textit{Magnetic field dependence of the normal mode spectrum of a planar complex plasma cluster}{\textquotedblright}. Kong M, Ferreira WP, Partoens B, Peeters FM, IEEE transactions on plasma science \textbf{32}, 569 (2004).   http://doi.org/10.1109/TPS.2004.826084

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