Generalizing the DGLAP Evolution of Fragmentation Functions to the   Smallest x Values
  An approach which unifies the Double Logarithmic Approximation at small x and the leading order DGLAP evolution of fragmentation functions at large x is presented. This approach reproduces exactly the Modified Leading Logarithm Approximation, but is more complete due to the degrees of freedom given to the quark sector and the inclusion of the fixed order terms. We find that data from the largest x values to the peak region can be better fitted than with other approaches. 
S. Albino, B. A. Kniehl, G. Kramer, W. Ochs