Real time evolution in spin diffusion on magnetic cluster R. Lahreche, R.-J. Tarento, P. Joyes, J. van de Walle and D. E. Mekki Eur. Phys. J. D, 24 1-3 (2003) 165-168 Published online: 03 July 2003 DOI: 10.1140/epjd/e2003-00143-4