diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 310f156d..efd267fc 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_de/three_d_plot_de.mmt</item>
         <item>asset:/doc_de/series_and_integrals_de.mmt</item>
         <item>asset:/doc_de/about_micromath_de.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0-de.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2-de.pdf</item>
     </string-array>
     <string name="activity_example">Beispiele</string>
     <string name="activity_welcome">asset:/doc_de/welcome_de.mmt</string>
diff --git a/app/src/main/res/values-es/strings.xml b/app/src/main/res/values-es/strings.xml
index e298406e..3745c6c0 100644
--- a/app/src/main/res/values-es/strings.xml
+++ b/app/src/main/res/values-es/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_es/three_d_plot_es.mmt</item>
         <item>asset:/doc_es/series_and_integrals_es.mmt</item>
         <item>asset:/doc_es/about_micromath_es.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0-es.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2-es.pdf</item>
     </string-array>
     <string name="activity_example">Ejemplos</string>
     <string name="activity_welcome">asset:/doc_es/welcome_es.mmt</string>
diff --git a/app/src/main/res/values-pt-rBR/strings.xml b/app/src/main/res/values-pt-rBR/strings.xml
index bfae3ce2..d66b406c 100644
--- a/app/src/main/res/values-pt-rBR/strings.xml
+++ b/app/src/main/res/values-pt-rBR/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_br/three_d_plot_br.mmt</item>
         <item>asset:/doc_br/series_and_integrals_br.mmt</item>
         <item>asset:/doc_br/about_micromath_br.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0-br.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2-br.pdf</item>
     </string-array>
     <string name="activity_example">Exemplo</string>
     <string name="activity_welcome">asset:/doc_br/welcome.mmt</string>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index e246dfd4..d7a7e2bc 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_ru/three_d_plot_ru.mmt</item>
         <item>asset:/doc_ru/series_and_integrals_ru.mmt</item>
         <item>asset:/doc_ru/about_micromath_ru.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0-ru.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2-ru.pdf</item>
     </string-array>
     <string name="activity_example">Примеры</string>
     <string name="activity_welcome">asset:/doc_ru/welcome_ru.mmt</string>
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index b0e47f0b..f269e529 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_en/three_d_plot.mmt</item>
         <item>asset:/doc_en/series_and_integrals.mmt</item>
         <item>asset:/doc_en/about_micromath.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2.pdf</item>
     </string-array>
     <string name="activity_example">示例</string>
     <string name="activity_welcome">asset:/doc_en/welcome.mmt</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index b2d4441c..f5709c33 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_en/three_d_plot.mmt</item>
         <item>asset:/doc_en/series_and_integrals.mmt</item>
         <item>asset:/doc_en/about_micromath.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2.pdf</item>
     </string-array>
     <string name="activity_example">範例</string>
     <string name="activity_welcome">asset:/doc_en/welcome.mmt</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index bcd0a601..f1ebb2d8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -50,7 +50,7 @@
         <item>asset:/doc_en/three_d_plot.mmt</item>
         <item>asset:/doc_en/series_and_integrals.mmt</item>
         <item>asset:/doc_en/about_micromath.mmt</item>
-        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.0.pdf</item>
+        <item>https://docs.google.com/viewer?url=https://github.com/mkulesh/microMathematics/raw/supplement/doc/microMathematics-v2.23.2.pdf</item>
     </string-array>
     <string name="activity_example">Examples</string>
     <string name="activity_welcome">asset:/doc_en/welcome.mmt</string>
diff --git a/doc/README.md b/doc/README.md
index 0935b94b..6517cf5a 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -8,6 +8,7 @@ In order to build the documentation, the LaTeX (texlive) and following latex pac
 - as the root user:
 ```
 # yum install texlive
+# yum install texlive-gensymb
 # yum install texlive-lipsum texlive-sectsty texlive-t2 texlive-lastpage texlive-lettrine texlive-titling texlive-fonts-tlwg babel texlive-minifp
 # yum install texlive-cyrillic texlive-babel-russian texlive-hyphen-russian texlive-lh 
 # yum install texlive-babel-german texlive-hyphen-german
@@ -27,5 +28,6 @@ After LaTeX is installed, call
 # ./build-doc.sh <version_code>
 ```
 
-Android Emulator used to export documentation:
-Nexus 4, 768 x 1280, 320 dpi
\ No newline at end of file
+Android Emulator used to export documentation: Nexus 4, 768 x 1280, 320 dpi
+
+On the device, generated documentation is placed here: /data/data/com.mkulesh.micromath.plus/files/doc
\ No newline at end of file
diff --git a/doc/microMathematics-br.tex b/doc/microMathematics-br.tex
index bb4623d2..490ae8c2 100644
--- a/doc/microMathematics-br.tex
+++ b/doc/microMathematics-br.tex
@@ -92,5 +92,5 @@ \subsection{O ícone do app}
 \end{tabular}\end{center}
 \begin{center}\begin{tabular}{c} \includegraphics[width=0.45\textwidth]{graphics/about_micromath_fig1.png} \end{tabular}\end{center}
 
-2014-2022, Bremen, Alemanha
+2014-2024, Bremen, Alemanha
 \end{document}
\ No newline at end of file
diff --git a/doc/microMathematics-de.tex b/doc/microMathematics-de.tex
index fe62d6f3..877d844f 100644
--- a/doc/microMathematics-de.tex
+++ b/doc/microMathematics-de.tex
@@ -99,7 +99,7 @@ \subsection{Das App Icon}
 
 \subsection{Lizenz}
 
-Copyright © 2014-2022 by Mikhail Kulesh
+Copyright © 2014-2024 by Mikhail Kulesh
 under the GNU General Public License,
 Version 3:
 www.gnu.org/licenses/gpl-3.0
diff --git a/doc/microMathematics-es.tex b/doc/microMathematics-es.tex
index 708fe824..0a875142 100644
--- a/doc/microMathematics-es.tex
+++ b/doc/microMathematics-es.tex
@@ -91,5 +91,5 @@ \subsection{Icono de la app}
 \end{tabular}\end{center}
 \begin{center}\begin{tabular}{c} \includegraphics[width=0.45\textwidth]{graphics/about_micromath_fig1.png} \end{tabular}\end{center}
 
-2014-2022, Bremen, Alemania
+2014-2024, Bremen, Alemania
 \end{document}
\ No newline at end of file
diff --git a/doc/microMathematics-ru.tex b/doc/microMathematics-ru.tex
index da688f8d..183ca620 100644
--- a/doc/microMathematics-ru.tex
+++ b/doc/microMathematics-ru.tex
@@ -99,7 +99,7 @@ \subsection{Иконка}
 
 \subsection{Лицензия}
 
-Copyright © 2014-2022 by Mikhail Kulesh
+Copyright © 2014-2024 by Mikhail Kulesh
 под лицензией GNU General Public License,
 Version 3:
 www.gnu.org/licenses/gpl-3.0
diff --git a/doc/microMathematics.tex b/doc/microMathematics.tex
index 0a2db675..5e93feab 100644
--- a/doc/microMathematics.tex
+++ b/doc/microMathematics.tex
@@ -94,7 +94,7 @@ \subsection{The app icon}
 
 \subsection{License}
 
-Copyright © 2014-2022 by Mikhail Kulesh
+Copyright © 2014-2024 by Mikhail Kulesh
 under the GNU General Public License,
 Version 3:
 www.gnu.org/licenses/gpl-3.0