Anatomy of the Proton Structure Functions in $\kappa$-factorization
  We present the first experiment-based parameterization of differential gluon structure function, which is called upon in many applications. We compare $\kappa$-factorization and DGLAP approaches and analyze properties of DGSF, with special emphasis on soft-to-hard/hard-to-soft diffusion. 
I. P. Ivanov and N. N. Nikolaev