2PFITZMANN B, WAIDNER M. Analysis of Liberty Single Sign-on with Enabled Clients[J]. Internet Computing, IEEE, 2003, 7(6): 25-28.
3CHALANDAR E, DARVISH P, RAHMANI M. A Centralized Cookie-based Single Sign-on in Distributed Systems[C]// Information and Communication Technology 5th International Conference. 2007 : 163-165.