  We show that combining forward and backward evolution allows to extract the
residues of the triple-pole pomeron and of the other singularities for 10
GeV$^2 \le Q^2 \le 1000$ GeV$^2$. In this approach, the essential singularity
generated by the DGLAP evolution is considered as a numerical approximation to
a triple-pole pomeron. Using an analytical expression for the form factors, we
reproduce the experimental data with a $\chi^2/dof$ of 1.02. This proves the
compatibility between Regge theory and DGLAP evolution. The method used here
enables us to evaluate the uncertainties on the gluon distribution which prove
to be large at small $x$ and small $Q^2$.
