The BFKL Equation at Next-to-Leading Order and Beyond
  On the basis of a renormalization group analysis of the kernel and of the solutions of the BFKL equation with subleading corrections, we propose and calculate a novel expansion of a properly defined effective eigenvalue function. We argue that in this formulation the collinear properties of the kernel are taken into account to all orders, and that the ensuing next-to-leading truncation provides a much more stable estimate of hard Pomeron and of resummed anomalous dimensions. 
M. Ciafaloni and D. Colferai (Dipartimento di Fisica, Universita' di   Firenze and INFN, Sezione di Firenze)