Cosmic Ray Acceleration at Relativistic Shock Waves
  Theory of the first-order Fermi acceleration of cosmic ray particles at relativistic shock waves is reviewed. We consider shocks with parallel and oblique, sub- and super-luminal magnetic field configurations and with finite-amplitude magnetic field perturbations. A role of oblique field configurations and field perturbations in forming the cosmic ray energy spectrum and changing the acceleration time scale is discussed. 
M. Ostrowski (Astronomical Observatory of the Jagiellonian University)