diff --git a/Example-Presentations.md b/Example-Presentations.md
index 00111e5..88d348f 100644
--- a/Example-Presentations.md
+++ b/Example-Presentations.md
@@ -91,7 +91,7 @@ Feel free to edit this page and add your own presentations below:
 * [Open source vs open data](http://jehb.github.io/presentations/todd2014/) by [@jehb](http://www.twitter.com/jehb)
 * [Instalación y arranque de la máquina virtual de Tegnix](http://www.ciges.net/revealjs_demo) by [@Ciges](http://www.ciges.net). In Spanish, first lesson of a course for a IT School and Consultancy called [Tegnix](http://www.tegnix.com/)
 * [OpenStreetMap for developers](http://cortesimone.github.io/slide-opengeodata-roma-2014/) by [Simone Cortesi](http://cortesi.com). In English, aimed at GIS professionals interested in the OSM world.
-* [Reduction of continuous SO(2) symmetry of spatially extended systems](http://www.cns.gatech.edu/~burak/talks/slice/) by [Nazmi Burak Budanur](http://www.cns.gatech.edu/~burak/). A scientific presentation with rotatable 3D figures generated using Pre3d.
+* [Reduction of continuous SO(2) symmetry of spatially extended systems](http://www.cns.gatech.edu/~burak/presentations/slice/index.html#/) by [Nazmi Burak Budanur](http://www.cns.gatech.edu/~burak/). A scientific presentation with rotatable 3D figures generated using Pre3d.
 * [Information Technology Project experience] 
   (http://slides.com/rasendrankirushan/project-experience-itp-2013) by Rasendran Kirushan
 * [Event Store JVM client](http://t3hnar.github.io/eventstore-jvm-client-slides) by [Yaroslav Klymko](https://github.com/t3hnar)
@@ -112,4 +112,4 @@ Feel free to edit this page and add your own presentations below:
 * [Paul's Launchpad - Portfolio of a Web Developer](http://www.pazellmer.com) by [pazell981](https://github.com/pazell981)
 * [Web Application Security in a nutshell](http://webappsec-nutshell.kimminich.de/) by [bkimminich](https://github.com/bkimminich)
 * [Simple Portfolio Example](http://vladimirmorin.info/) by [Vladimir Morin](https://github.com/VladimirMorin)
-* [OpenStack Swift Intro](http://ddxgz.github.io/slides/swift.html) by [Cong Peng](https://github.com/ddxgz)
+* [OpenStack Swift Intro](http://ddxgz.github.io/slides/swift.html) by [Cong Peng](https://github.com/ddxgz)
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