diff --git a/.classpath b/.classpath
index d8d70de..ee66325 100644
--- a/.classpath
+++ b/.classpath
@@ -18,7 +18,6 @@
 	<classpathentry kind="lib" path="lib/commons-text-1.9.jar" sourcepath="lib/commons-text-1.9-sources.jar"/>
 	<classpathentry kind="lib" path="lib/tika-core-1.24.1.jar" sourcepath="lib/tika-core-1.24.1-sources.jar"/>
 	<classpathentry kind="lib" path="lib/catgenerator-core-0.1.7.jar" sourcepath="lib/catgenerator-core-0.1.7-sources.zip"/>
-	<classpathentry kind="lib" path="lib/xidyn-1.11.2.jar" sourcepath="lib/xidyn-1.11.2-sources.zip"/>
 	<classpathentry kind="lib" path="lib/jOpenDocument-1.3.jar" sourcepath="lib/jOpenDocument-src-1.3.zip"/>
 	<classpathentry kind="lib" path="lib/threeten-extra-1.5.0.jar" sourcepath="lib/threeten-extra-1.5.0-sources.jar"/>
 	<classpathentry kind="lib" path="lib/Logs/slf4j-api-1.7.32.jar" sourcepath="lib/Logs/slf4j-api-1.7.32-sources.jar"/>
diff --git a/lib/README b/lib/README
index 2f0835d..0773aa8 100644
--- a/lib/README
+++ b/lib/README
@@ -1,9 +1,10 @@
 Description of used libraries:
 
 - Logs/
-    - log4j             log API
+    - log4j-api         log API
+    - log4j-core
+    - log4j-slf4j-impl	adaptation layer between slf4j and log4j
     - slf4j-api         facade log API
-    - slf4j-log4j12     adaptation layer between slf4j and log4j
     
 - UnitTesting/
     - hamcrest-core     required by junit
diff --git a/lib/xidyn-1.11.2-sources.zip b/lib/xidyn-1.11.2-sources.zip
deleted file mode 100644
index 00d1097..0000000
Binary files a/lib/xidyn-1.11.2-sources.zip and /dev/null differ
diff --git a/lib/xidyn-1.11.2.jar b/lib/xidyn-1.11.2.jar
deleted file mode 100644
index bd7e91b..0000000
Binary files a/lib/xidyn-1.11.2.jar and /dev/null differ