Roughness and finite size effect in the NYSE stock-price fluctuations V. Alfi, F. Coccetti, A. Petri and L. Pietronero Eur. Phys. J. B, 55 2 (2007) 135-142 Published online: 14 June 2006 DOI: 10.1140/epjb/e2006-00240-8