Heavy Quark Production at $e^+ e^-$ Colliders in Multijet Events and a   New Method of Computing Helicity Amplitudes
  Heavy quark production in multijet events at $e^+e^-$ colliders is studied at tree level. Total production rates are given and compared with the corresponding results for massless quarks. A new method of computing helicity amplitudes is briefly sketched. Talk presented at the XXIXth Rencontres de Moriond, QCD and High Energy Hadronic Interactions, Meribel, France, March 19-26 1994. 
Alessandro Ballestrero, Ezio Maina and Stefano Moretti (U. of Torino,   Italy)