1. Strong-Signal Theory of a Free-Electron Laser
2. Proc. Intern. School of Physics “Enrico Fermi”;Moore,1978
3. Optics Comm.;Bambini;Series in Theoretical Physics,1979
4. Series in Theoretical Physics,1978
5. see R. Bonifacio, P. Meystre, G.T. Moore and M.O. Scully, to be published.