Artefacts and <A2> power corrections : revisiting the MOM Z_psi and Z_V
  We extract the power corrections due to the A^2 condensate in the overlap quark propagator (vector part of the inverse propagator Z_psi). The results are consistent with the previous gluon analysis. The role of artefacts is extensively discussed. 
Ph. Boucaud, F. de Soto, J.P. Leroy, A. Le Yaouanc, J. Micheli, H.   Moutarde, O. Pene, J. Rodriguez-Quintero