+.. _Lin4Neuro: http://www.nemotos.net/lin4neuro
+.. _fail2ban: http://www.fail2ban.org
+
+.. Debian releases
+.. _Debian 6.0 (squeeze): http://www.debian.org/releases/squeeze
+.. _Debian 7.0 (wheezy): http://www.debian.org/releases/wheezy
+.. _Debian 8.0 (jessie): http://www.debian.org/releases/jessie
+
+.. Desktop environments
+.. _GNOME: http://www.gnome.org/
+.. _GNOME3: http://www.gnome.org/gnome-3/
+.. _XFCE: http://www.xfce.org/
+.. _XFCE4: http://www.xfce.org/