Photon Structure: QCD Treatment and Parton Densities
  The QCD treatment of the photon structure beyond the leading order is discussed with emphasis on a proper choice of the factorization scheme and/or the boundary conditions. Recent parametrizations of the photon's parton content are examined and compared. The sensitivity of the photon structure function on the QCD scale parameter is reconsidered. 
Andreas Vogt (Univ. Munich)