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\bibitem{Armelao_etal2007} {\textquotedblleft}\textit{Highly dispersed mixed zirconia and hafnia nanoparticles in a silica matrix: First example of a ZrO2-HfO2-SiO2 ternary oxide system}{\textquotedblright}. Armelao L, Bertagnolli H, Bleiner D, Groenewolt M, Gross S, Krishnan V, Sada C, Schubert U, Tondello E, Zattin A, Advanced functional materials  (2007).   http://doi.org/10.1002/ADFM.200600458

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