1. Two-loop QCD corrections to the heavy quark form factors: the vector contributions
2. The LEP Collaborations ALEPH, DELPHI, L3, OPAL, LEP Electroweak Working Group, SLD Heavy Flavour Group, A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model, report LEPEWWG/2003-01, April 2003
3. W. Bernreuther, R. Bonciani, T. Gehrmann, R. Heinesch, T. Leineweber, E. Remiddi, in preparation