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The mechanisms of spontaneous and induced radiation produced by relativisticparticles passing through natural and photonic crystals are reviewed. Thetheory of Volume Free Electron Lasers based on spontaneous radiation in naturaland photonic crystals is presented.

Spontaneous and Induced Radiation by Relativistic Particles in Natural  and Photonic Crystals. Crystal X-ray Lasers and Volume Free Electron Lasers  (VFEL)