====== TTP99-21 Recent results with heavy quarks and light lepton bound states ======
 
 
   <hidden TTP99-21  Recent results with heavy quarks and light lepton bound states > Recent results on second order quantum corrections to semileptonic 
 decays of b quarks and positronium spectroscopy are reviewed.
 Similarities between calculations in these seemingly different problems
 are demonstrated.  Technical aspects of solving systems of recurrence 
 relations, and application of dimensional regularization to bound states
 are explained.
 </hidden>
|**A. Czarnecki, K. Melnikov and A. Yelkhovsky**  | 
|**      Radiative Corrections: Application of quantum field theory to phenomenology, Proceedings of the 4th international symposium, Barcelona, 1998, edited by Joan Sola (World Scientific, Singapore, 1999), p. 125-138 **  |
| {{preprints:1999:ttp99-21.pdf|PDF}} {{preprints:1999:ttp99-21.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9904479|arXiv]]   |
| |