Stabilities Referring to the f Electron Effect in Erbium-Based Endohedral Metallofullerenes: Revisiting Er2@C80 and the Missing Er2C2@C78 | Inorganic Chemistry pubs.acs.org/doi/10.1021/... Zhao and co-workers @InorgChem #erbium #metallofullerenes #EMFs #ETS_NOCV