Jν⁡(z)=12⁢π⁢ⅈ⁢∫-∞-ⅈ⁢c-∞+ⅈ⁢cΓ⁡(t)Γ⁡(ν-t+1)⁢(12⁢z)ν-2⁢t⁢ⅆ⁡t,