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diff --git a/content/seminars/cs-theory.pdf b/content/seminars/cs-theory.pdf
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diff --git a/fr/index.org b/fr/index.org
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--- a/fr/index.org
+++ b/fr/index.org
@@ -110,10 +110,6 @@ Liens rapides :
    - Understanding Evolution: A Methodology for Evaluating the
      Extensibility of Boolean Networks’ Structure and Function
      ([[file:../content/seminars/sbn-extension-beam-bioss-ia.pdf][diapositives]])
-   - Theory of Computer Science: Why All That Formal Stuff?
-     ([[file:../content/seminars/cs-theory.pdf][diapositives]])
-   - Universality and Computational Completeness of Controlled Leftist
-     Insertion-Deletion Systems ([[file:../content/seminars/leftist-univ-beam.pdf][diapositives]])
 
    #+ATTR_HTML:  :alt image de la licence Creative Commons Attribution Alone  :class ccby
    [[https://fr.wikipedia.org/wiki/Licence_Creative_Commons][file:../content/imgs/ccby.png]]
diff --git a/index.org b/index.org
index 98cb3e0..d3669f5 100644
--- a/index.org
+++ b/index.org
@@ -104,9 +104,6 @@ Jump to:
    - Sequential Reprogramming of Biological Network Fate ([[file:content/seminars/cmsb-extension-beam.pdf][slides]])
    - Understanding Evolution: A Methodology for Evaluating the
      Extensibility of Boolean Networks’ Structure and Function ([[file:content/seminars/sbn-extension-beam-bioss-ia.pdf][slides]])
-   - Theory of Computer Science: Why All That Formal Stuff? ([[file:content/seminars/cs-theory.pdf][slides]])
-   - Universality and Computational Completeness of Controlled Leftist
-     Insertion-Deletion Systems ([[file:content/seminars/leftist-univ-beam.pdf][slides]])
 
    #+ATTR_HTML:  :alt image of Creative Commons Attribution Alone licence  :class ccby
    [[https://en.wikipedia.org/wiki/Creative_Commons_license][file:content/imgs/ccby.png]]