[1] [CITE@en[Draft: PubSubHubbub Core 0.1 -- Working Draft]]
([TIME[2009-07-20 07:31:37 +09:00]] 版)
<http://pubsubhubbub.googlecode.com/svn/trunk/pubsubhubbub-core-0.1.html>

[2] [CITE@en[RFC 5988 - Web Linking]]
( ([TIME[2012-03-22 09:19:11 +09:00]] 版))
<http://tools.ietf.org/html/rfc5988#page-13>