diff --git a/revealjs/alternative_energy/index.html b/revealjs/alternative_energy/index.html
index 21f103b..63c35a8 100644
--- a/revealjs/alternative_energy/index.html
+++ b/revealjs/alternative_energy/index.html
@@ -472,7 +472,8 @@
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                 <ul>
                   <li class="image">Wikimedia Commons: <a href="https://commons.wikimedia.org/wiki/File:Barrage_de_la_rance.jpg">Barrage de la rance.jpg</a><sup>‡</sup>: <a href="https://commons.wikimedia.org/wiki/User:Oliver_H">Oliver H</a></li>
-                  <li>…</li>
+                  <li>strom magazin: <a href="https://archive.fo/fQeZm">Gezeitenkraftwerk: Segen oder Fluch für die Umwelt?</a><sup>✝$</sup></li>
+                  <li>energie-strom.com: <a href="https://archive.fo/HHndJ">Gezeitenkraftwerk</a><sup>✝$</sup></li>
                 </ul>
               </td>
             </tr>