1. Laser Acceleration of Particles, AIP Conference Proceedings No. 91, edited by P. J. Channell (American Institute of Physics, New York, 1982).
2. The Challenge of Ultra-High Energies, Proceedings of ECFA-RAL meeting, Oxford, 1982 (Rutherford Appleton Laboratory, England, 1983).
3. Undulators and ‘free-electron lasers’
4. Laser Beat Wave Electron Accelerator
5. C. Pellegrini, in Ref. 1, p. 138 and in Ref. 2, p. 249.