* [http://wiki.nmr-relax.com/Relax_4.0.2 Official release notes on the relax wiki].
* [https://{{gna link|url=gna.org/forum/forum.php?forum_id=2533 |text=Gna! news item]}}.
* [http://article.gmane.org/gmane.science.nmr.relax.announce/70 Gmane mailing list archive].
* [https://www.mail-archive.com/relax-announce@gna.org/msg00060.html Mail Archive]