Small x behavior of the slope dlnF_2/dln(1/x) in the framework of   perturbative QCD
  Using an analytical parameterization for the behavior of the x slope of the structure function F_2 at small x in perturbative QCD, at the leading twist approximation of the Wilson operator product expansion, and applying a flat initial condition in the DGLAP evolution equations, we found very good agreement with new precise deep inelastic scattering experimental data from HERA. 
A.V. Kotikov, G. Parente