Jν⁡(z)⁢Jν⁡(ζ)=12⁢π⁢ⅈ⁢∫c-ⅈ⁢∞c+ⅈ⁢∞⁢exp⁡(12⁢t-z2+ζ22⁢t)⁢Iν⁡(z⁢ζt)⁢ⅆ⁡tt,