↑ 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.