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\bibitem{Li_etal2005} Li Y, Zhang XB, Tao XY, Xu JM, Chen F, Shen LH, Yang XF, Liu F, Van Tendeloo G, Geise HJ (2005) Single phase MgMoO$_{4}$ as catalyst for the synthesis of bundled multi-wall carbon nanotubes by CVD. Oxford, 1325--1328

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