Resonant Enhancement of Coherent Phonons in Carbon Nanotubes Observed with Sub-10fs Time ResolutionI. Katayama, K. Tahara, J. Takeda, K. Yanagi, J. Tang and M. KitajimaEPJ Web of Conferences, 41 (2013) 04028DOI: https://doi.org/10.1051/epjconf/20134104028