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\bibitem{Shpanchenko_etal2008} {\textquotedblleft}\textit{Synthesis and crystal structure of new titanyl phosphate Sr$_{2}$TiO(PO$_{4}$)$_{2}$}{\textquotedblright}. Shpanchenko RV, Tsirlin AA, Hadermann J, Antipov EV, Russian chemical bulletin \textbf{57}, 552 (2008).   http://doi.org/10.1007/s11172-008-0085-9

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