On the evaluation of the evolution operator Z_Reg(R_2,R_1) in the   Diakonov-Petrov approach to the Wilson loop
  We evaluate the evolution operator Z_Reg(R_2,R_1) introduced by Diakonov and Petrov for the definition of the Wilson loop in terms of a path integral over gauge degrees of freedom. We use the procedure suggested by Diakonov and Petrov (Phys. Lett. B224 (1989) 131) and show that the evolution operator vanishes. 
M. Faber, A. N. Ivanov, N. I. Troitskaya