Classical and Quantum Phenomenology in Radiation by Relativistic   Electrons in Matter or in External Fields
  Phenomenological aspects of radiation by relativistic electrons in external field, in matter or the vicinity of matter are reviewed, among which: infrared divergence, coherence length effects, shadowing, enhancement in aligned crystals, quantum recoil and spin effects, electron side-slipping, photon impact parameter and the presence of tunnelling in the radiation process. 
Xavier Artru
physics.acc-ph