The importance of centralities in dark network value chains Noemi Toth, László Gulyás, Richard O. Legendi, Paul Duijn, Peter M.A. Sloot and George Kampis Eur. Phys. J. Special Topics, 222 6 (2013) 1413-1439 Published online: 13 September 2013 DOI: 10.1140/epjst/e2013-01935-7