Fermionic Corrections to the Heavy-Quark Pair Production in the   Quark-Antiquark Channel
  We describe the analytic calculation of the fermionic two-loop QCD corrections to the heavy-quark pair production process in the quark-antiquark channel. 
R. Bonciani, A. Ferroglia, T. Gehrmann, D. Maitre, and C. Studerus