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\bibitem{Vranjes_etal2008} {\textquotedblleft}\textit{Electrostatic modes in multi-ion and pair-ion collisional plasmas}{\textquotedblright}. Vranjes J, Petrovic D, Pandey BP, Poedts S, Physics of plasmas \textbf{15}, 072104 (2008).   http://doi.org/10.1063/1.2949696

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