[1]
[CITE[OpenID: Specs]] <http://www.openid.net/specs.bml>

[2] [CITE[OpenID の苦悩と葛藤 - Mi manca qualche giovedi`?]] ([TIME[2009-01-27 19:55:24 +09:00]] 版) <http://d.hatena.ne.jp/n_shuyo/20080929/openid>