Deep Inelastic Scattering with Tagged Photons at HERA
  We calculate cross-sections for neutral current deep inelastic scattering at HERA with photon tagging. Both the exact lowest-order cross-section and a leading logarithmic approximation of next-order corrections are calculated. The latter amounts to less than 20% in a large kinematical range. The integrations are performed numerically but without relying on Monte Carlo methods. 
D. Bardin, L. Kalinovskaya and T. Riemann