The investigation of spin effects in photon production with fermion pair   in gamma-gamma collisions
  The exclusive reaction $ \gamma\gamma\to f \bar{f} \gamma$ is considered as the possible calibration process on the linear photon collider. We analyse the energy spectrum and total cross section dependence on the detector parameters at various initial beam helicities. 
T.V. Shishkina, V.V. Makarenko