Networks of equities in financial markets G. Bonanno, G. Caldarelli, F. Lillo, S. Miccichè, N. Vandewalle and R. N. Mantegna Eur. Phys. J. B, 38 2 (2004) 363-371 Published online: 14 May 2004 DOI: 10.1140/epjb/e2004-00129-6