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\bibitem{Li_etal2007} {\textquotedblleft}\textit{Behavior of Ni-doped MgMoO$_{4}$ single-phase catalysts for synthesis of multiwalled carbon nanotube bundles}{\textquotedblright}. Li Y, Zhang X, Geise HJ, Van Tendeloo G, Chemical vapor deposition \textbf{13}, 30 (2007).   http://doi.org/10.1002/cvde.200606531

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