Comments on two papers by Kapusta and Wong
  We critically examine recently published results on the thermal production of massive vector bosons in a quark-gluon plasma. We claim the production rate is a collinear safe observable. 
P. Aurenche (LAPTH), R. Baier (Univ. Bielefeld), T. Becherrawy (Univ.   Nancy), Y. Gabellini (INLN), F. Gelis (BNL), T. Gran...