Clustering in gravitating N-body systems M. Bottaccio, A. Amici, P. Miocchi, R. Capuzzo Dolcetta, M. Montuori and L. Pietronero Europhys. Lett., 57 3 (2002) 315-321 Published online: 01 September 2002 DOI: 10.1209/epl/i2002-00462-x