Propagation of ultra-short pulses in resonant atomic systems : Observation and control M.A. Bouchene, J.C. Delagnes, M. Jacquey, S. Bonhommeau, P. Zahariev, A. Monmayrant, B. Chatel et B. Girard J. Phys. IV France, 119 (2004) 13-18 DOI: 10.1051/jp4:2004119003