Erratum to: “Direct renormalization of two-electron self-energy contribution to energy of helium-like ions” [Phys. Lett. A 265 (2000) 207-216]

Please note that an error has occurred in the printing of Eq. (14). The correct version should be:∆E_ext^irr={e⁴}/{4π}\limit_∑P(-1)^P\limit_∑n₁(∊_n1≠∊_a)<P(a)|Σ∼(r₃₄)|n₁> <n₁P(b)|{U(r₁₂)}/{∊₁}|ab>+\limit_∑n₁(∊_n1≠∊_a)<P(a)P(b)|{U(r₁₄)}/{∊₁}|n₁b> <n₁|Σ∼(r₂₃)|a>.So there should be a `+' in front of the third summation sign Σ, not a `×'.