Double-logarithmic behavior of inelastic fermion form factors in QED and   QCD
  The effective kinematic diagram technique is applied to study inelastic form factors of electron and quark in QED and QCD. The explicit expressions for these form factors in the double-logarithmic approximation are presented. The self-consistency of the results is shown by demonstrating the fulfillment of the Kinoshita-Lee-Nauenberg theorem. 
E. Bartos, E. A. Kuraev, I. O. Cherednikov