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\bibitem{Liu_etal2006} {\textquotedblleft}\textit{Simulation of disk- and band-like voids in dusty plasma systems}{\textquotedblright}. Liu YH, Chen ZY, Huang F, Yu MY, Wang L, Bogaerts A, Physics of plasmas \textbf{13}, 052110 (2006).   http://doi.org/10.1063/1.2201058

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