Phonons in colloidal crystalsR. S. Penciu, M. Kafesaki, G. Fytas, E. N. Economou, W. Steffen, A. Hollingsworth and W. B. RusselEurophys. Lett., 58 5 (2002) 699-704DOI: https://doi.org/10.1209/epl/i2002-00322-3