diff --git a/content/feed-research.md b/content/feed-research.md
index 1eea7ed..ce37286 100644
--- a/content/feed-research.md
+++ b/content/feed-research.md
@@ -15,3 +15,6 @@ I still need to check out, maybe to get even more specs in this wiki.
 * [MICAN](http://web.archive.org/web/20061119044412if_/http://www.haun.org/~konishi/mican/mican.html) (an antenna agent that supports HINA and DIRP)
 * [CATS](http://web.archive.org/web/20061025190435/http://www.teu.ac.jp/nsit/~yatagawa/cats/spec.html)
 * [NATSU](http://www.harmonicom.jp/natsu/)
+* [RSS 1.0 proposed modules](https://web.archive.org/web/20090603023528/http://web.resource.org/rss/1.0/modules/proposed.html)
+* [Epistula Syndication Format](https://web.archive.org/web/20060826184417/http://www.aquarionics.com/article/name/esf)
+* [eXchangeable Faceted Metadata Language](https://web.archive.org/web/20060830145845/http://www.xfml.org/)