单点登录参考

http://www.docin.com/p-5227988.html?docfrom=rrela  单点登录技术文档

http://www.docin.com/p-1430853047.html?_t_t_t=0.16638332161534652  单点登录技术现状

http://www.cnblogs.com/ywlaker/p/6113927.html 单点登录入门

http://www.cnblogs.com/notDog/p/5264666.html CAS教学博客（一共有八篇，其为起始篇）

http://www.docin.com/p-48320549.html?docfrom=rrela 单点登录实例详解