"It´s time for Single Sign-On yet", Earl Perkins, Meta Group/Gartner 2003
"Justify Identity Management", Roberta Witty, Kris Brittain, Ant Allan, Gartner 2004
"Security Comparison: SSO versus Password Synchronisation?, Jonathan Penn Forrester Research 2004
"Trends 2005: Identity Management-Compliance, Connectivity and the Customer?, Jonathan Penn, Forrester Research 2004