Study on the Electronic Structure and Stability of Some Endohedral   Fullerenes - RE3N@C80 (RE = Sc, Y, La) by PM7
  In this paper, we investigated the electronic structure of some endohedral fullerenes containing rare earth nitride and the stability of their benzyne-adducts by PM7, the semiempirical Hatree-Fock method. 
Kye-Ryong Sin, Sun-Gyong Ko, Kwang-Yong Ri and Song-Jin Im
physics.chem-ph