The Transverse Quark Distribution and Proton Electromagnetic Form   Factors in Skew Distribution Formalism
  Skew density matrices can be diagonalized to yield probability interpretation. The power-counting prediction of perturbative QCD is found consistent with recent CEBAF data on $F_2(Q^2)/F_1(Q^2)$ 
Roman V. Buniy, Pankaj Jain and John P. Ralston