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\bibitem{Piacente_etal2004} {\textquotedblleft}\textit{Normal modes of a quasi-one-dimensional multichain complex plasma}{\textquotedblright}. Piacente G, Peeters FM, Betouras JJ, Physical review : E : statistical physics, plasmas, fluids, and related interdisciplinary topics \textbf{70} (2004).   http://doi.org/10.1103/PhysRevE.70.036406

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