V⁡(a,z)=2π⁢ⅇ14⁢z2⁢za-122⁢π⁢ⅈ⁢Γ⁡(12-a)⁢∫-ⅈ⁢∞ⅈ⁢∞Γ⁡(t)⁢Γ⁡(12-a-2⁢t)⁢2t⁢z2⁢t⁢cos⁡(π⁢t)⁢ⅆ⁡t,