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\bibitem{Filippousi_etal2015} {\textquotedblleft}\textit{Direct observation and structural characterization of natural and metal ion-exchanged HEU-type zeolites}{\textquotedblright}. Filippousi M, Turner S, Katsikini M, Pinakidou F, Zamboulis D, Pavlidou E, Van Tendeloo G, Microporous and mesoporous materials: zeolites, clays, carbons and related materials \textbf{210}, 185 (2015).   http://doi.org/10.1016/j.micromeso.2015.01.043

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