An. Artemyev et al., Vacuum-polarization screening corrections to the energy levels of heliumlike ions - art. no. 022116, PHYS REV A, 6202(2), 2000, pp. 2116
Calculations of the vacuum-polarization screening corrections to the low-ly
ing energy levels of He-like highly charged ions are presented. The calcula
tions are carried out for extended nuclei in the range Z = 20-100.