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\bibitem{Tkachenko_etal2011} {\textquotedblleft}\textit{Dispersion relations for circular single and double dusty plasma chains}{\textquotedblright}. Tkachenko DV, Sheridan TE, Misko VR, Physics of plasmas \textbf{18}, 103709 (2011).   http://doi.org/10.1063/1.3651194

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