FREE ELECTRON LASER IN THE INFRARED : THE EXPERIMENTAL ACTIVITY AT THE ENEA FRASCATI CENTRE U. Bizzarri, F. Ciocci, G. Dattoli, A. De Angelis, M. Ercolani, E. Fiorentino, G.P. Gallerano, T. Letardi, A. Marino, G. Messina et al. (3 de plus) J. Phys. Colloques, 44 C1 (1983) C1-313-C1-332 DOI: 10.1051/jphyscol:1983126