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\bibitem{Chen_etal2011} {\textquotedblleft}\textit{Multimodal zeolite-beta-based catalysts with a hierarchical, three-level pore structure}{\textquotedblright}. Chen L-H, Li X-Y, Tian G, Li Y, Tan H-Y, Van Tendeloo G, Zhu G-S, Qiu S-L, Yang X-Y, Su B-L, Chemsuschem \textbf{4}, 1452 (2011).   http://doi.org/10.1002/cssc.201100181

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