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\bibitem{Esquivel+Zelaya2011} {\textquotedblleft}\textit{Synthesis and characterisation of lanthanide-based dioxide}{\textquotedblright}. Esquivel MR, Zelaya E, Advances in applied ceramics \textbf{110}, 219 (2011).   http://doi.org/10.1179/1743676110Y.0000000021

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