[1] [CITE[REXMLのDoS脆弱性]] ([TIME[2009-08-01 09:13:55 +09:00]] 版) <http://www.ruby-lang.org/ja/news/2008/08/23/dos-vulnerability-in-rexml/>

[2] [CITE[The Web Application Security Consortium / XML Entity Expansion]] ([TIME[2014-07-31 09:47:30 +09:00]] 版) <http://projects.webappsec.org/w/page/13247002/XML%20Entity%20Expansion>

[3] [CITE@en[RFC 3023 - XML Media Types]] ([TIME[2014-07-11 12:46:44 +09:00]] 版) <http://tools.ietf.org/html/rfc3023#page-27>

[4] [CITE@en[Billion laughs - Wikipedia, the free encyclopedia]] ([TIME[2014-06-29 21:22:17 +09:00]] 版) <http://en.wikipedia.org/wiki/Billion_laughs>

[6] [CITE@en[RFC 4918 - HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)]] ([TIME[2014-09-21 17:04:59 +09:00]] 版) <http://tools.ietf.org/html/rfc4918#section-20.6>

[5] [CITE@en[RFC 7303 - XML Media Types]]
( ([TIME[2014-07-07 20:56:43 +09:00]] 版))
<http://tools.ietf.org/html/rfc7303#page-26>