Update resource links on main page.

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

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@@ -161,9 +161,10 @@ posloužit následující odkazy:
 * Překlad [Karl Fogel: Tvorba open source softwaru](http://knihy.nic.cz/), CZ.NIC, z. s. p. o., 2012, ISBN-13: 978-80-904248-5-2
 * Floss Manuals <http://flossmanuals.net/>
 * The Linux Documentation Project <http://tldp.org/>
-* Popis programátorských technik v Unixu <http://dce.felk.cvut.cz/pos/os_api/unix.html> 
+* Popis programátorských technik v Unixu <https://wiki.control.fel.cvut.cz/pos/os_api/unix.html>
 * GNU Operating System <http://www.gnu.org/>
-* Embedded Linux kernel and driver development, <https://bootlin.com/>
+* The Open Group Base Specifications Issue 7, 2018 edition IEEE Std 1003.1-2017 (Revision of IEEE Std 1003.1-2008) [POSIX.1-2017](https://pubs.opengroup.org/onlinepubs/9699919799/idx/topic.html)
+* Embedded Linux kernel and driver development, <https://bootlin.com/> [Docs](https://bootlin.com/docs/)
 * Love R.: Linux Kernel Development (2nd Edition), Novell Press, 2005.
 * Corbet J., Rubini A., Kroah-Hartman G.: Linux Device Drivers (3rd Edition), O'Reilly Media, Inc., 2005, ISBN-10: 0596005903, ISBN-13: 978-0596005900
 * [An Exploration of Fedora’s Online Open Source Development Community](http://www.cyber-anthro.com/beta-an-exploration-of-fedora%E2%80%99s-online-open-source-development-community/)