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\bibitem{Herkelrath_etal2008} {\textquotedblleft}\textit{Fragmentation of an infinite ZnO$_{2}$ square plane into discrete [ZnO$_{2}$]$^{2-}$ linear units in the oxyselenide Ba$_{2}$ZnO$_{2}$Ag$_{2}$Se$_{2}$}{\textquotedblright}. Herkelrath SJC, Saratovsky I, Hadermann J, Clarke SJ, Journal of the American Chemical Society \textbf{130}, 14426 (2008).   http://doi.org/10.1021/ja8063414

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