Complete electroweak one-loop radiative corrections to top-pair   production at TESLA -- a comparison
  Electroweak one-loop radiative corrections to the process e^+ e^- -> t tbar are revisited. Two groups from Karlsruhe and Bielefeld/Zeuthen performed independent calculations of both (virtual and soft) QED contributions and weak virtual corrections. For the angular distribution an agreement of at least eight digits for the weak corrections and of at least seven digits for additional photonic corrections is established. 
J. Fleischer, T. Hahn, W. Hollik, T. Riemann, C. Schappacher and A.   Werthenbach