An. Artem'Ev et al., The contribution of diagrams of screened vacuum polarization to the ground-state energy of a two-electron multiply charged ion, OPT SPECTRO, 84(1), 1998, pp. 1-3
Corrections for screened vacuum polarization to the ground-state energy of
a two-electron multiply charged ion are calculated in a wide range of the n
uclear charge Z = 20-100.