Equation Icon  1 ∫ ( αβ ′ ′′ ′ ′ ′ αβ ) γ αβ(x) = − --- G + γ′δ′(x,x′)∇ εγγ δ(x′) − γ γδ(x′)∇ εG + γ′δ′(x,x′) dΣε′, (365 ) 4π Σ