Perturbative calculation of the Sternheimer anti-shielding factor with   Hartree-Fock atomic orbitals
  We report a calculation of the Sternheimer anti-shielding factor, \gamma, by means of first order perturbation theory. In quality of basis functions, we use Hartree-Fock electronic orbitals, expanded on hydrogenic atomic states. The computed \gamma(r) for Fe^{3+} and Cu^{1+} inner electronic cores are reported and compared with literature values, obtained from alternative methodologies. 
E. Diaz Suarez, Carlos M. Cruz Inclan and Augusto Gonzalez
cond-mat.mtrl-sci