\[w_{0}(z)=w_{2}(z)\int\frac{w_{1}(z)r(z)}{\mathscr{W}\left\{w_{1}(z),w_{2}(z)%
\right\}}\,\mathrm{d}z-w_{1}(z)\int\frac{w_{2}(z)r(z)}{\mathscr{W}\left\{w_{1}%
(z),w_{2}(z)\right\}}\,\mathrm{d}z.\]