Homogeneous and heterogeneous clustering in the accretion regime P. Feiden, J. Leygnier, Ph. Cahuzac and C. Bréchignac Eur. Phys. J. D, 43 1-3 (2007) 49-52 Published online: 24 May 2007 DOI: 10.1140/epjd/e2007-00082-0