6J. Gantz& D. Reinsel. The Digital Universe Decade-Are You Ready?, IDC White Paper, May 2010.
7D. Zeng et al., Social Media Analytics and Intelligence, IEEE Intelli- gent Systems,vol.25,no.6,2010,13-16.
8M. Mambo, K. Usuda&E. Okamoto. Proxy signatures for delegating signing operation.Proc.3rd ACM Conference on Computer and Communications Security.ACM Press. 1996,48-57.
