Y.-Z. Ma, M. W. Graham, G. R. Fleming, L. Valkunas, S. M. Bachilo ‘Probing Exciton Dynamics of Semiconducting Single Walled Carbon Nanotubes Using Photon Echo Spectroscopy’ 15th International Conference on ‘Ultrafast Phenomena’ Pacific Grove, California, USA, 2006, July 30-August 4.