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Zhang, J.; Bowles, F. L.; Bearden, D. W.; Ray, W. K.; Fuhrer, T.; Ye, Y.; Dixon, C.; Harich, K. et al. (2013). “A missing link in the transformation from asymmetric to symmetric metallofullerene cages implies a top-down fullerene formation mechanism”. Nature Chemistry5 (10): 880–885. doi:10.1038/nchem.1748. PMID24056346.