Storage ring free electrons laser on super-ACO, ELETTRA and SOLEIL M.E. Couprie, C. Brunie, D. Garzella, L. Nahon, G. De Ninno, D. Nutarelli and M. Marsi J. Phys. IV France, 12 5 (2002) 339-341 DOI: 10.1051/jp4:20020185