Dynamics and correlations in magnetic colloidal systems studied by X-ray photon correlation spectroscopy J. Lal, D. Abernathy, L. Auvray, O. Diat and G. Grübel Eur. Phys. J. E, 4 3 (2001) 263-271 Published online: 15 March 2001 DOI: 10.1007/s101890170108