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Rausch, Henrik; Braun, Tibor . (1997). Instrumental Neutron Activation Analysis of Trace Element Impurities in Graphite Soot, Gold Grade C <sub/>60</sub> and C <sub/>70</sub> and in Super Gold Grade C <sub/>60</sub>. Fullerene Science and Technology, 5(2), 407–418. doi:10.1080/15363839708012000 
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