Results of the free electron laser oscillation experiments on the ACO storage ring P. Elleaume, J.M. Ortéga, M. Billardon, C. Bazin, M. Bergher, M. Velghe, Y. Petroff, D.A.G. Deacon, K.E. Robinson et J.M.J. Madey J. Phys. France, 45 6 (1984) 989-996 DOI: 10.1051/jphys:01984004506098900