Equation 18.38.3B9A41484DEE3

\begin{equation} \int _{\mathbb P^ q}\frac{|Z^\ell |^2}{|Z|^{2m}}\, \sigma ^ q =\frac{q!\, \ell _0!\cdots \ell _ q!}{(m+q)!}, \qquad |\ell |=m. \end{equation}