Networks of equities in financial marketsG. Bonanno, G. Caldarelli, F. Lillo, S. Miccichè, N. Vandewalle and R. N. MantegnaEur. Phys. J. B, 38 2 (2004) 363-371DOI: https://doi.org/10.1140/epjb/e2004-00129-6