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diff --git a/further_topics/lectures/topics-chapter.tex b/replicability/lectures/topics-chapter.tex
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diff --git a/scientificcomputing-script.tex b/scientificcomputing-script.tex
index 21daaba..5bacd1b 100644
--- a/scientificcomputing-script.tex
+++ b/scientificcomputing-script.tex
@@ -88,18 +88,20 @@
 
 % add chapter on mutual information
 
-% add chapters on linear algebra, PCA, clustering
+% add chapters on linear algebra, PCA, clustering, see linearalgebra/
 
 % add chapter on simple machine learning
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %\part{Tools}
-% Latex
+% Latex -> see latex/
 % markdown, html
 % Makefile
-% version control (git and github) only put source files into repository!
 % distributed computing (ssh and grid engines)
+%
+% see replicability/ :
+% version control (git and github) only put source files into repository!
 % data handling (structure, storage (rsync), backup, data bases)
 % data annotation, meta data