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Rausch, H.; Braun, T.; Dódony, I.; Lovas, G. . (1999). Determination of sulfur as an impurity in commercial C60, fullerene soot and sublimed C60 polycrystals by INAA. The Analyst, 124(3), 417–419. doi:10.1039/a808657e 
10.1039/a808657e