Q2-evolution of parton densities at small x values. Charm contribution   in the combined H1 and ZEUS F2 data
  The Bessel-inspired behavior of parton densities at small x, obtained in the case of the flat initial conditions for DGLAP evolution equations, is used in the fixed flavor scheme to analyze precise H1+ZEUS combined data on the structure function F2. 
A. V. Kotikov and B.G. Shaikhatdenov
hep-ph