\[R_{-a}\left(\mathbf{b};\mathbf{z}\right)=\frac{z_{1}^{a^{\prime}-b_{1}}}{%
\mathrm{B}\left(b_{1},a^{\prime}-b_{1}\right)}\int_{0}^{\infty}t^{b_{1}-1}(t+z%
_{1})^{-a^{\prime}}\*R_{-a}\left(\mathbf{b};0,t+z_{2},\dots,t+z_{n}\right)\,%
\mathrm{d}t,\]