@article{DT089,
   Author = {Tomanek, D. and Li, Y. S.},
   Title = {Ionicity of the M-C$_{60}$ bond in M$@$C$_{60}$
            endohedral complexes},
   Journal = {Chem. Phys. Lett.},
   Volume = {243},
   Number = {1-2},
   Pages = {42--44},
   Year = {1995},
   url = {http://dx.doi.org/10.1016/0009-2614(95)00839-V},
   doi = {10.1016/0009-2614(95)00839-V}
 }