Coupling of valence particles/holes to 68,70Ni studied via measurements of the B(E2) strength in 67,69,70Ni and 71Cu - Mach, H.; Lewitowicz, M.; Stanoiu, M.; Becker, F.; Blomqvist, J.; Borge, M.J.G.; Boutami, R.; Cederwall, B.; Dlouhy, Z.; Fogelberg, B.; Fraile, L.M.; Georgiev, G.; et al. (Nuclear Physics A, 2003)