Multi-leg calculations with the GRACE/1-LOOP system. --Toward Radiative   Corrections to e+e- -> mu nu-bar u d-bar --
  We performed the calculation of the full O(alpha) corrections to e+e- -> mu- nu-bar u d-bar with the help of the GRACE/1-LOOP system. We discuss how a finite decay width introduces a serious gauge invariance breaking, particularly for infrared 5-point functions. This is related to the way the reduction of those functions is performed and to the treatment of the width in the reduction. 
F. Boudjema (1), J. Fujimoto (2), T. Ishikawa (2), T. Kaneko (2),   K.Kato (3), Y. Kurihara (2), and Y. Shimizu (2) ((1) LAP...