1. See, e.g., W. B. Colson, Classical Theory of Free Electron Laser Laser Handbook, edited by W. B. Colson, C. Pellegrini, and A. Renieri (North-Holland, Amsterdam, 1990), Vol. VII.
2. G. Dattoli, A. Renieri, and A. Torre, Lectures on Free Electron Laser Theory and Related Topics (World Scientific, Singapore, 1993).
3. P. Elleaume, Nucl. Instrum. Meth. A 237, 28 (1985) and references therein.NIMAER0168-9002
4. G. Dattoli, T. Hermsen, L. Mezi, A. Renieri, and A. Torre, Phys. Rev. A 37, 4334 (1988), and references therein.PLRAAN1050-2947
5. K. A. Sturges and W. B. Colson, Nucl. Instrum. Methods A 318, 576 (1992).NIMAER0168-9002